Quote Originally Posted by superquag View Post

As a silent alternative, - and I have'nt investigated the logistics apart from price ($300 or so last year) - Use an aqualung tank... with a regulator to drop from 100,000/whatever psi down to 150. Some sand-drivers use them for Very Quick tyre re-inflation. Refilling was around $35 when last checked.
Scuba tanks can be refilled from $2 to $10 depending on the dive shop. Trouble with Scuba tanks is they MUST be tested every year, Thats the $35 figure inc refilling. The Scuba regulator 1st stage that connects to the tank releases air at about 140psi ( I think correct me if I am wrong )