Abstract: A pneumatically actuatable dispenser for a two-part adhesive, as provided within a cartridge having two chambers and having a mixing nozzle mounted upto a first end, each chamber having a plunger accessible from a second end. A front frame holds the cartridge. A piston is arranged to be selectively driven within a cylinder in a forward or reverse direction. A pair of piston rods operate in tandem so as to drive the plungers toward the nozzle, when driven conjointly with the piston in the forward direction. A first valve, when actuated, delivers pressurized air from driving the piston in the forward direction. A second valve, when actuated, delivers pressurized air for driving the piston in the opposite direction. A third valve, when actuated while the first valve is actuated, vents pressurized air from the cylinder.