Originally Posted by
nak81783
Some valves have a step in the on/off hole, so they only require one oring. I think that is only for old RT and E-Mag valves though, but it may be for some of the old Classic valves as well.
Only the early retro/RT/emag valves had the stepped indentation in the on-off hole. All classic/AIR valves, newer retro valves, and all X-valves have the flat bottom on the on-off hole.
The larger urethane oring holds the smaller oring in place above the on-off top. In the classic valve the small oring is teflon so that it will work with CO2. In the retro valve it is urethane. In the emag it is a buna quad oring.
Except for the Automag in front, its usually the man behind the equipment that counts.