1/2" Diaphragm Pump With polypropylene air motor, polypropylene wetted parts, polypropylene check valve seats, nitrile balls and nitrile diaphragms. Single piece manifold design. Suitable for motor oil, gear oil and transmission fluid. Not recommended for oil use in a "closed" system (where the pump remains pressurized when not in use) without thermal relief kit PR-100 Use for antifreeze and windshield washer fluid MUST RE-TORQUE ALL BOLTS prior to installation