DIN O-Rings

[Gombessa]

Basic Q: I accidentally dove with redundant o-rings yesterday (the o-ring from my DIN plug stuck in the tank, and I screwed my regulator on top of that), the result being that a nice sliver of rubber has pinched off from the o-ring in the reg. Do DIN regs all use the same size o-ring, or is there some variability based on model/manufacturer?

 

[pescador775]

DIN is an industrial standard so I doubt that the O ring spec is allowed to vary for normal connections. I believe that the DIN threaded plug uses the old "fat" O ring used on most valve types until the late 1970's. I understand that this O ring is also used on certain modern valves which convert to DIN or yoke connections. If that is correct, the number is -112. I understand that there is something called a "small" DIN regulator which uses the -111 O ring.

 

[PhilEllis]

DIN is an industrial standard so I doubt that the O ring spec is allowed to vary. I believe that the DIN threaded plug uses the old "fat" O ring used on most valve types until the late 1970's. I understand that this O ring is also used on certain modern valves which convert to DIN or yoke connections. If that is correct, the number is -112.

It is the AS568-112 90 durometer for the "standard" DIN fitting. Of course, there are those very few who need the -111, but those people usually know who they are as a result of previous unsuccessful attempts to cram a -112 into the fitting.

Phil Ellis

 

[Gombessa]

Thanks a lot, 112 sounds like it's exactly what I need.

 

[scubafanatic]

.... I agree that, for the most part, '112' size is what you need, however, my Atomic DIN reg actually uses the 'small DIN' O-ring '111' size, so it's possible you might need different sizes depending on the specific application.