ISO 19880-7:2025
(Main)Gaseous hydrogen — Fuelling stations — Part 7: Rubber O-rings
Gaseous hydrogen — Fuelling stations — Part 7: Rubber O-rings
This document specifies the requirements for rubber O-rings and their housing dimensions, which seal gaseous hydrogen, in high-pressure hydrogen devices for gaseous hydrogen fuelling stations, such as valves, filters, joints, breakaways and other such devices. This document is applicable to O-rings suitable for sealing hydrogen gas of up to 70 MPa nominal working pressure, in the operating temperature range of −40 °C to 65 °C. This document contains safety requirements for the design of O-rings and their housing dimensions, compound design, and test methods for seal systems. This document applies to newly manufactured O-rings for hydrogen gas seal in high-pressure hydrogen devices used in hydrogen fuelling stations. NOTE 1 This document was developed using the ISO 3601 series. NOTE 2 This document was developed based on several temperature classes of rubber O-rings suitable for use with high-pressure hydrogen seals in devices for gaseous hydrogen stations. NOTE 3 The operating temperature is not a temperature of the hydrogen gas to be sealed by the O-ring gas seal system. Regardless of the operating temperature, the hydrogen gas temperature to be sealed can rise up to 180 °C. NOTE 4 The O-ring seal system for the high-pressure hydrogen devices are designed by the device manufacturers. The detailed specifications of the O-rings and design of static or non-static high-pressure hydrogen seal systems for the high-pressure hydrogen devices are determined as agreed upon between the interested parties by referring to this document.
Carburant d'hydrogène gazeux — Stations-service — Partie 7: Joints toriques en caoutchouc
General Information
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International
Standard
ISO 19880-7
First edition
Gaseous hydrogen — Fuelling
2025-08
stations —
Part 7:
Rubber O-rings
Carburant d'hydrogène gazeux — Stations-service —
Partie 7: Joints toriques en caoutchouc
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Inside diameters, cross-section diameters and tolerances . 2
4.1 Configuration .2
4.2 Inside diameters, d , cross-section diameter, d , and tolerances .3
1 2
4.3 Methods of measuring for receiving inspection .3
5 Housing dimensions . 3
5.1 O-ring housings .3
5.2 Requirements .3
5.2.1 Housing dimensions .3
5.2.2 Determining O-ring size for custom housing dimensions .3
5.2.3 Determining housing fill in design of housing .4
5.2.4 Determining temperature in design of housings .4
6 Inspection and quality acceptance criteria . 4
7 Anti-extrusion rings (back-up rings) . 4
8 Specification of rubber materials . 4
8.1 Rubber materials .4
8.2 Curing systems .5
8.3 O-ring requirements .5
8.4 Detailed requirements of O-ring materials .7
9 Designation system . 17
9.1 General .17
9.2 Designation codes .17
9.3 Identification statement .18
10 Instruction manual .18
10.1 General .18
10.2 Verification prior to use .18
Annex A (normative) Exposure test in hydrogen gas . 19
Annex B (normative) Criteria for appearance of exposed test pieces .21
Annex C (informative) O-ring stress/strain and compression set testing .22
Bibliography .23
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at www.iso.org/
patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement. For an explanation of the voluntary nature of standards, the meaning of ISO
specific terms and expressions related to conformity assessment, as well as information about ISO's
adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.
A list of all parts in the ISO 19880 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 19880-7:2025(en)
Gaseous hydrogen — Fuelling stations —
Part 7:
Rubber O-rings
1 Scope
This document specifies the requirements for rubber O-rings and their housing dimensions, which seal gaseous
hydrogen, in high-pressure hydrogen devices for gaseous hydrogen fuelling stations, such as valves, filters,
joints, breakaways and other such devices. This document is applicable to O-rings suitable for sealing hydrogen
gas of up to 70 MPa nominal working pressure, in the operating temperature range of −40 °C to 65 °C.
This document contains safety requirements for the design of O-rings and their housing dimensions,
compound design, and test methods for seal systems. This document applies to newly manufactured O-rings
for hydrogen gas seal in high-pressure hydrogen devices used in hydrogen fuelling stations.
NOTE 1 This document was developed using the ISO 3601 series.
NOTE 2 This document was developed based on several temperature classes of rubber O-rings suitable for use with
high-pressure hydrogen seals in devices for gaseous hydrogen stations.
NOTE 3 The operating temperature is not a temperature of the hydrogen gas to be sealed by the O-ring gas seal
system. Regardless of the operating temperature, the hydrogen gas temperature to be sealed can rise up to 180 °C.
NOTE 4 The O-ring seal system for the high-pressure hydrogen devices are designed by the device manufacturers.
The detailed specifications of the O-rings and design of static or non-static high-pressure hydrogen seal systems for
the high-pressure hydrogen devices are determined as agreed upon between the interested parties by referring to
this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48-2:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 815-1:2019, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient
or elevated temperatures
ISO 1382, Rubber — Vocabulary
ISO 1629, Rubber and latices — Nomenclature
ISO 2921, Rubber, vulcanized — Determination of low-temperature characteristics — Temperature-retraction
procedure (TR test)
ISO 3601-1:2012, Fluid power systems — O-rings — Part 1: Inside diameters, cross-sections, tolerances and
designation codes
ISO 3601-1, Fluid power systems — O-rings — Part 1: Inside diameters, cross-sections, tolerances and
designation codes
ISO 3601-2:2016, Fluid power systems — O-rings — Part 2: Housing dimensions for general applications
ISO 3601-2, Fluid power systems — O-rings — Part 2: Housing dimensions for general applications
ISO 3601-3, Fluid power systems — O-rings — Part 3: Quality acceptance criteria
ISO 3601-4, Fluid power systems — O-rings — Part 4: Anti-extrusion rings (back-up rings)
ISO 5598, Fluid power systems and components — Vocabulary
ISO 14687:2019, Hydrogen fuel quality — Product specification
ISO 18899, Rubber — Guide to the calibration of test equipment
ISO 19880-1, Gaseous hydrogen — Fuelling stations — Part 1: General requirements
ASTM D1414, Standard Test Methods for Rubber O-Rings
ASTM D1414-15, Standard Test Methods for Rubber O-rings
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1382, ISO 5598 and ISO 19880-1
and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
operating temperature
environmental temperature in which a device equipped with an O-ring gas seal system operates
4 Inside diameters, cross-section diameters and tolerances
4.1 Configuration
The shape of the O-ring shall be toroidal, as shown in Figure 1.
d
Key
d inside diameter
d cross-section diameter
Figure 1 — Typical O-ring configuration
4.2 In
...
FINAL DRAFT
International
Standard
ISO/FDIS 19880-7
ISO/TC 197
Gaseous hydrogen — Fuelling
Secretariat: SCC
stations —
Voting begins on:
2025-04-30
Part 7:
Rubber O-rings
Voting terminates on:
2025-06-25
Carburant d'hydrogène gazeux — Stations-service —
Partie 7: Joints toriques en caoutchouc
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 19880-7:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 19880-7:2025(en)
International
Standard
ISO/FDIS 19880-7
ISO/TC 197
Gaseous hydrogen — Fuelling
Secretariat: SCC
stations —
Voting begins on:
Part 7:
Rubber O-rings
Voting terminates on:
Carburant d'hydrogène gazeux — Stations-service —
Partie 7: Joints toriques en caoutchouc
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 19880-7:2025(en) © ISO 2025
ii
ISO/FDIS 19880-7:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Inside diameters, cross-section diameters and tolerances . 2
4.1 Configuration .2
4.2 Inside diameters, d , cross-section diameter, d , and tolerances .3
1 2
4.3 Methods of measuring for receiving inspection .3
5 Housing dimensions . 3
5.1 O-ring housings .3
5.2 Requirements .3
5.2.1 Housing dimensions .3
5.2.2 Determining O-ring size for custom housing dimensions .3
5.2.3 Determining housing fill in design of housing .3
5.2.4 Determining temperature in design of housings .4
6 Inspection and quality acceptance criteria . 4
7 Anti-extrusion rings (back-up rings) . 4
8 Specification of rubber materials . 4
8.1 Rubber materials .4
8.2 Curing systems .5
8.3 O-ring requirements .5
8.4 Detailed requirements of O-ring materials .7
9 Designation system . 17
9.1 General .17
9.2 Designation codes .17
9.3 Identification statement .18
10 Instruction manual .18
10.1 General .18
10.2 Verification prior to use .18
Annex A (normative) Exposure test in hydrogen gas . 19
Annex B (normative) Criteria for appearance of exposed test pieces .21
Annex C (informative) O-ring stress/strain and compression set testing .22
Bibliography .23
iii
ISO/FDIS 19880-7:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at www.iso.org/
patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement. For an explanation of the voluntary nature of standards, the meaning of ISO
specific terms and expressions related to conformity assessment, as well as information about ISO's
adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.
A list of all parts in the ISO 19880 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
FINAL DRAFT International Standard ISO/FDIS 19880-7:2025(en)
Gaseous hydrogen — Fuelling stations —
Part 7:
Rubber O-rings
1 Scope
This document specifies the requirements for rubber O-rings and their housing dimensions, which seal gaseous
hydrogen, in high-pressure hydrogen devices for gaseous hydrogen fuelling stations, such as valves, filters,
joints, breakaways and other such devices. This doument is applicable to O-rings suitable for sealing hydrogen
gas of up to 70 MPa nominal working pressure, in the operating temperature range of −40 °C to 65 °C.
This document contains safety requirements for the design of O-rings and their housing dimensions,
compound design, and test methods for seal systems. This document applies to newly manufactured O-rings
for hydrogen gas seal in high-pressure hydrogen devices used in hydrogen fuelling stations.
NOTE 1 This document was developed using the ISO 3601 series.
NOTE 2 This document was developed based on several temperature classes of rubber O-rings suitable for use with
high-pressure hydrogen seals in devices for gaseous hydrogen stations.
NOTE 3 The operating temperature is not a temperature of the hydrogen gas to be sealed by the O-ring gas seal
system. Regardless of the operating temperature, the hydrogen gas temperature to be sealed can rise up to 180 °C.
NOTE 4 The O-ring seal system for the high-pressure hydrogen devices are designed by the device manufacturers.
The detailed specifications of the O-rings and design of static or non-static high-pressure hydrogen seal systems for
the high-pressure hydrogen devices are determined as agreed upon between the interested parties by referring to
this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48-2:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 815-1:2019, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient
or elevated temperatures
ISO 1382, Rubber — Vocabulary
ISO 1629, Rubber and latices — Nomenclature
ISO 2921, Rubber, vulcanized — Determination of low-temperature characteristics — Temperature-retraction
procedure (TR test)
ISO 3601-1:2012, Fluid power systems — O-rings — Part 1: Inside diameters, cross-sections, tolerances and
designation codes
ISO/FDIS 19880-7:2025(en)
ISO 3601-1, Fluid power systems — O-rings — Part 1: Inside diameters, cross-sections, tolerances and
designation codes
ISO 3601-2:2016, Fluid power systems — O-rings — Part 2: Housing dimensions for general applications
ISO 3601-2, Fluid power systems — O-rings — Part 2: Housing dimensions for general applicat
...
ISO/DISFDIS 19880-7
ISO/TC 197
Secretariat: SCC
Date: 2023-11-222025-04-16
Gaseous hydrogen — Fuelling stations —
Part 7:
Rubber O-rings
Carburant d'hydrogène gazeux — Stations-service —
Partie 7: Joints toriques en caoutchouc
DISFDIS stage
Warning for WD’s and CD’s
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to change
without notice and may not be referred to as an International Standard.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
ISO/FDIS 19880-7:2025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO/DIS 19880-7:2025(en)
iii
ISO/DIS 19880-7:2025(en)
Contents
Foreword . iv
Scope . iv
Normative references . iv
Terms and definitions . iv
Inside diameters, cross-section diameters and tolerances . iv
Configuration . iv
Inside diameters, d 1 , cross-section diameter, d 2 , and tolerances . iv
Methods of measuring for receiving inspection . iv
Housing dimensions . iv
O-ring housings . iv
Requirements . iv
Inspection and quality acceptance criteria . iv
Anti-extrusion rings (back-up rings) . iv
Specification of rubber materials . iv
Rubber materials. iv
Curing systems . iv
O-ring requirements. iv
Detailed requirements of O-ring materials. iv
Designation system . iv
General . iv
Designation codes . iv
Identification statement . iv
Instruction manual . iv
General . iv
Verification prior to use . iv
(normative) Exposure test in hydrogen gas . iv
(normative) Criteria for appearance of exposed test pieces . iv
(informative) O-ring stress/strain and compression set testing . iv
Bibliography . iv
Part 7: Rubber O-rings . 2
1 Scope . 2
2 Normative references . 2
3 Terms and definitions . 3
3.1 . 3
4 Inside diameters, cross-section diameters and tolerances . 3
4.1 Configuration . 3
4.2 Inside diameters, d , cross-section diameter, d , and tolerances . 4
1 2
4.3 Methods of measuring for receiving inspection . 4
iv
ISO/DIS 19880-7:2025(en)
5 Housing dimensions . 4
5.1 O-ring housings . 4
5.2 Requirements . 5
5.2.1 Housing dimensions . 5
5.2.2 Determining O-ring size for custom housing dimensions . 5
5.2.3 Determining housing fill in design of housing . 5
5.2.4 Determining temperature in design of housings. 5
6 Inspection and quality acceptance criteria . 6
7 Anti-extrusion rings (back-up rings) . 6
8 Specification of rubber materials . 6
8.1 Rubber materials . 6
8.2 Curing systems. 6
8.3 O-ring requirements . 7
8.4 Detailed requirements of O-ring materials . 1
9 Designation system . 13
9.1 General . 13
9.2 Designation codes . 13
9.3 Identification statement . 13
10 Instruction manual . 13
10.1 General. 13
10.2 Verification prior to use . 14
Annex A (normative) Exposure test in hydrogen gas . 15
Annex B (normative) Criteria for appearance of exposed test pieces . 18
Annex C (informative) O-ring stress/strain and compression set testing . 20
Bibliography . 21
v
ISO/DIS 19880-7:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documentsdocument should be noted. This document was drafted in accordance with the editorial rules
of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).www.iso.org/directives).
Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence,
validity or applicability of any claimed patent rights. in respect thereof. As of the date of publication of this
document, ISO had not received notice of (a) patent(s) which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which may be
obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for
identifying any or all such patent rights. Details of any patent rights identified during the development of the
document will be in the Introduction and/or on the ISO list of patent declarations received (see
www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation onof the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL:
www.iso.org/iso/foreword.html.), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.
A list of all parts in the ISO 360119880 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.www.iso.org/members.html.
vi
ISO/DIS 19880-7:2025(en)
ISO/DIS 19880-7:2025(en)
Gaseous hydrogen — Fuelling stations —
Part 7:
Rubber O-rings
1 Scope
This document specifies the requirements for rubber O-rings and their
...
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