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I spent weeks one summer replacing most of what you listed and 100+ push lock fittings with compression fittings and all new norgren valves. And we still have the hidden fittings that just don’t leak enough to hear and can’t be accessed easily to check. My coach sat for 6 mos over the winter, and my main tanks never went below 60psi, but my auxiliary compressor would still come on at least twice a day in my building that is heated, but only about 50 degrees.