Philadelphia Mixers Stainless Steel Pneumatic Mixer. Model: PGA-8-3. Portable clamp on mixer. (3) adjustable and collapsible impellers. Impeller diameters: 8-1/2 in. dia., 12-3/4 in. dia., 13-3/4 in. dia. Mixer is powered by a pneumatic motor and gear drive which provides maximum torque output, reduces heat build-up and allows for spark free operation. Speeds can be varied by means of the air control valve. Pneumatic motor: 2.0 hp, 1750 rpm air motor. Gear drive ratio: 5:1. Final rpm: 350. Air inlet: (1) 3/8 in. push on air hose fittings. Shaft dimensions: 3 ft. 6-3/8 in. L x 1-1/4 in. diameter. Overall dimensions: 9-3/8 in. L x 1 ft. 2-1/2 in. W x 4 ft. 10 in. H. (ACN35)