Ideas on where to find a "T" union for a Firestone airbag setup.
Summit has em, but it's part of a $30 kit. Just need the T union.

 

www.grainger.com

www.mcmaster.com

try your local hardware store

 

D.O.T. grade air fittings can be found at NAPA, Fleetpride, or any Class7-8 truck parts store or most fastener stores

 

Or hit your local hardware store, you can get brass pipe fittings and hose nipples in various sizes and make up a tee fitting. Usually 1/4" or 3/8" pipe fitting is about the right size, then get hose nipples to screw in to match the size of hose you are using on the bags.