12 gram tire valve adapter

look in the bike section of your local K-MART, Bi-Mart,etc. There is a tire pump that looks like a black pepper spray canister which holds a 12 gram cartige and screws on to a standard tire valve. It has a lever type trigger and works extreemly well you can release as much gas as you need. this unit must be operated in the vertical position. cost was $12. I have a air chamber 2"x 2.5ft 1 canister took it to 40psi impressive for that little package