A pneumatic powered caulking gun for medium to high viscosity resin, polyurethane systems, sealers, and joint compounds. Produces 1,100 lbs. of thrust @ 100 psi service air pressure. Capable of handling plural component cartridges size including 750ml x 750ml, 750ml x 300ml, 750ml, 75ml x 150ml, 600ml x 600ml, 600ml x 300ml, and 300ml x 300ml. Easily converts with Snap-in/Snap-off push disks. Gun has adjustable pressure regulator built in and a air dump valve that stops flow immediately. Also has a reverse air control for withdrawing product on overfill.