4SF50GS1 – 4SF DIRECT DRIVE PLUNGER PUMPS Home > Brands > CAT Pumps > Plunger Pumps > 4SF50GS1 – 4SF DIRECT DRIVE PLUNGER PUMPS Posted on September 29, 2016October 17, 2016 by tugz Technical Specifications Max Flow: 5 Min Pressure: 100 Max Pressure: 3000 Inlet Port Size: 0.5 Discharge Port Size: 0.37 RPM: 3200 Drive Type(s): Direct Material: Brass (BB)