Series 20 Grease Bare Pumps, 50:1, 400 lb

Lightweight, corrosion-resistant zinc head casting design incorporates uniform wall thickness and an integral patented muffler which keeps noise level below OSHA standards. 150 psi pre-lubricated air motor requires no external oilier. Pneumatically assisted mechanical air valve assures positive tripping. Springless sir motor construction prevents premature pump failure due to spring fatigue. Precision-machined, hardened steel slide valve for longer life.