Hypro Small Twin Piston Pump Assembly (5330C-HRX) Hypro Small Twin Piston Pump Assembly (5330C-HRX) Max. 3 GPM Flow ;Max. 500 PSI Pressure ; Max. 1800 RPM ; Max. 140 deg. F fluid temp. 5/8" I.D. hollow shaft ; Buna-N rubber cup material 1/2" NPT inlet and outlet ports Cast iron construction ; 10 lb. weight