Pentair C1-216P Diffuser Replacement Sta-Rite Max-E-Glas/Dura-Glas Series Inground Pool and Spa Pump Diffuser replacement Fits Pentair Sta-Rite 1/2-horsepower and 3/4-horsepower Max-E-Glas/Dura-Glas series full rate and up-rate inground pool/spa pump Measures 6-3/8-inch length by 6-3/8-inch width by 1-3/4-inch height