Oring recommendation for tank reg

[Alexndl]

Had a leak at the set screw near the tnak thread, decided to open it.
Found a dead oring on the piston. Could I use a standard oring with 70 harness at this location or I need hard oring (urethane 90 I would assume?)

Its a pure energy tank reg 3000 psi

[Alexndl]

Found the manual the oring info

They ask for 90 but I only have 70...

Also pin valve seal (6) is not specified (look like an automag on off teflon oring)

[caylegeorge]

I would really go with Urethane 90 if you can.

These guys have a lot of sizes:
https://www.theoringstore.com/store/...=367_1322_1327

Also - Most all regs I have seen use a teflon o ring as you suspected near the pin in the #6 position you mentioned.