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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


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