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Scubapro has two tiny o-rings on their s-wing poppet. Its Scubapro part #010050363
I seen in a prior post its either 2.5x1mm or 2.2X1mm. Is this 2.5MM OD & 1MM ID? I think this is what it means. I looked on McMaster's website and could not find them.. looks like they don't sell them that small under their metric section..
I baught a bunch of kits from Germany and got them today. But wanted to get a few extra to have in my box.
Scubapro says it is 2.2mm ID and 1mm thick material. A friend of mine is using a 2-002 which is 1.07mm ID and 1.27mm thick. I guess it stretches enough and works OK.
When I replace those o-rings on my regs, I put a new ring in the top (furthest inside the balance chamber) position and move the top o-ring down to the lower (outside) position. The inner o-ring makes the seal and the outer o-ring protects it from abrasion damage.