AP-2 Air Purge Gun - Round with 02 Mixing Chamber | This economically priced gun weighing a mere 2.4 lbs (1.1 kg) is one of the lightest and smallest plural component spray guns on the market today. The Chamber, PCT, Screen Screw Parts, Coupling Block and Check Valves are the same parts used in the proven PMC AP-2 Air Purge Gun. FINANCING AVAILABLE