Hydra cell D2504 high pressure pump with some parts. Older pump ,been sitting for some time. Has hardened valves,one inch drive shaft with 1/4 inch keyway. brass valve body . Pump weighs 125 pounds. Designed for high temp and various liquids. This pump is capable of 1000 pounds pressure with right RPM to pump ratio. This pump works on the same order as a small RV camper pump but with 3 , three inch diaphragms .