scagrotto
Contributor
id make sure it doesnt leak/ make noise when you breath off it before leaving the shop.
Make sure you test it on a full tank, and not one that's got 900PSI. Many years ago I picked up our regs after they had been serviced, and they seemed fine in the shop. A little while later my wife hooked hers up on a boat, and when she opened the tank valve it whistled like a boiling tea kettle. Back at the shop they claimed that any problems would show up with fairly low pressure, but it was pretty easy to stick it on the tank next to the counter and then a full one from the back and improve their knowledge base (assuming they really believed 900 PSI was adequate).
Of course in hindsight it's pretty obvious that a malfunctioning reg might prevent flow at 900 PSI, but not at 3000. IIRC, it was a pretty minor defect in the piston. Maybe it got missed or maybe it was damaged during servicing.