Wednesdays
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i have a number of Poseidon P300 + Cyclone 3000, did you ever own K75? they were a "brick on wheels" the same analogy applies here to the P300, its an ancient reg. again from the 60's, just after double hose regs, its very simple to service, its cheap to service, its not high performing but reliable underwater and under ice, would you agree ?The time to "upgrade" is when you can't get parts, it's broken beyond reasonable repair, or you just want another reg, and can afford it.
I mainly use a first from 2010, and seconds I like, mostly older, and not a match to the first. A lot of dives are on vintage, or at least old, regs I've picked up and repaired, '80's and earlier. If I was younger, I might try some of the new regs, or just go to Poseidon, as the old '60's model I have is still better than anything new I've tried.