Our fleet mechanic suggested this. He's been diving for a long time. I'm a certified diver, but if you get a SCBA, no "U", tank- the ones for firefighters- scuba shops will fill it for you. The set-ups are different. I have a set of SCBA's for work, and I had no problem getting them filled. Never got carded /forums/images/graemlins/rotfl.gif If you shop for a used one, it's around $50. Try even city, state, and county auctions.