Question Beuchat VS2 1st stage Repair

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piston stem o-ring should be replaced. It should be a standard size o-ring duro 70.
Due to the high pressure differential, a duro 85-90 is called for when replacing the stem o-ring.
 
Due to the high pressure differential, a duro 85-90 is called for when replacing the stem o-ring.
You are right, that's because I've edited the answer. The Piston o-ring should be 70 (moving LP), but the stem 90 (moving HP).
 
https://www.shearwater.com/products/swift/

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