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

Features: 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 | One piece pump outlet body withstands constant high lubricant pressures | Nitride steel plunger and bushings resist abrasion and prolong pump life | All pumps are 100% electronically tested to assure quality performance | Shovel-type foot valve adds mechanical priming to normal suction