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Yes. Unless you have an older service kit, all the Apeks service kits (and newly shipped regulators) use O2 compatible components. I think Apeks only states that their Green XTX/DS4 DIN can be used with 40 to 100%, but there is no difference between that regulator and a standard XTX/DS4 other than green color parts.
Yes. I have an assortment of DST’s and DS4’s mated with TX, ATX and XTX seconds that I use for my deco regs and bailouts. I clean all my regs the same and don’t put specific regs on specific bottles. One day a reg might be on a 32% bottle and the following weekend it might be on a 100% bottle.