I don't know about the Apeks reg, but the Sherwood DIN fitting uses a 2-112, the Posideon uses a metric sized 11.3mm ID x 2.4mm cross section (Poseidon P/N 1007). The ScubaPro Mk IX, X, and 15 also uses the metric 11.3 x 2.4 size (ScubaPro O-ring P/N 193). You should use 90 durometer if you can get them, but a 70-75 durometer won't extrude at up to 4,000 psi if the reg and valve are in good condition and the reg is fully threaded into the valve. The 2-112 is readily available in 90 durometer. You might have to buy a large quantity to get the metric 11.3x2.4. You can get a 2-111 size o-ring (and sometimes even the 112) to work on regs that use the metric size o-rings if you need to. It isn't the right size though, but I know that people do it. It is life support equipment, so consider that. -Randy -- Send mail for the `techdiver' mailing list to `firstname.lastname@example.org'. Send subscribe/unsubscribe requests to `email@example.com'.
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