Pentair C4-77P Plastic Base Replacement Sta-Rite Pool and Spa Pump Base replacement Fits Pentair Sta-Rite Dyna-Glas/Dyna-Max Series, Dyna-Pro/Dyna-Pro E pool and spa pumps Also fits Sta-Rite TPE Dyna-Jet Series, Dyna-Wave Series pool and spa pumps Made of corrosion resistant plastic