For the urethane models, you're looking at a range of -65°F to 220°F.
Answer by: Customer Support on Dec 15, 2025, 10:05 AM
got an o-ring that calls for a -342 size, do these backup rings match up with that?
Question by: Diane G on Aug 28, 2025, 1:15 PM
Sizes on these back up rings correspond to O-Ring sizes, so the -342 dash size is meant to pair with a -342 O-Ring.
Answer by: Customer Support on Aug 30, 2025, 6:14 AM
these stretch for install right? trying to figure out if i need any special tools to get em seated around the groove or if they just snap back on their own
Question by: Roy T on Jan 22, 2026, 5:24 PM
Urethane back-up rings like these are molded to stretch during installation and then return quickly to their original size once in place. No special tooling required. The material has enough memory to seat itself properly without fighting you, which makes the job go a lot smoother than working with stiffer materials.
Answer by: Customer Support on Jan 24, 2026, 7:02 AM
these back-up rings stretch for install and then snap back to size? asking cause last set i bought from somewhere else were a pain to get seated right
Question by: Bobby P on Jan 8, 2026, 8:42 PM
Urethane at 90A durometer has enough flex to stretch over a shaft or into a groove during installation, then returns quickly to its original shape once seated. That snap-back behavior is actually one of the reasons this material gets used where fit precision matters. You should find the process a good bit easier than whatever you were working with before.
Answer by: Customer Support on Jan 10, 2026, 6:43 PM
What's the deal with the size? Is it the same as a regular O-ring?
Question by: Rusty S on Feb 11, 2026, 10:49 AM
Sizes correspond to O-Ring sizes, so you should be able to find a direct replacement.
Answer by: Customer Support on Feb 13, 2026, 6:32 AM
i got an o-ring that’s a -342 size, are these backup rings matched up to that same sizing?
Question by: Danny H on Dec 30, 2025, 5:33 PM
Sizes correspond to O-ring sizes, so a -342 back-up ring is meant to pair with a -342 O-ring.
Answer by: Customer Support on Jan 1, 2026, 6:37 AM
