Urethane 112 sized o-rings. For use on standard DIN regulators/valves. Ready for O2 service.
This urethane o-ring material offers superior abrasion and cut resistance, and offers performance which far surpasses that of traditional viton, rubber or EPDM o-rings. The only weakness, is that urethane o-rings are susceptible to damage from UV light, which is generally not a concern if it is kept out of sunlight.
The only time you will need to replace this o-ring is if you loose it.
They are suitable for oxygen service.