The number you posted is the one I have dialed repeatedly.
However, after your post I dialed it again and DiverAirMan answered straightaway. Go figger.
I'd like to buy air fill for cylinders. I've been to a number of dive equipment shops, many do not sell air, many say they buy air from a guy name of DiverAir. I call DiverAir number, no one answers.
Please, tell me where I may go with a cylinder and buy air on the spot.