Hypro 5321C-H Small Twin Plunger Pump , 2.2 GPM @ 1000 PSI @ 1800 RPM, Cast iron pump with torque arm and Buna-N seals, 5/8" ID hollow shaft, 1/2" NPT ports, 190 deg. max. temp., Plunger material: Stainless Steel, 11 lbs.