Pentair U9-374 Diffuser O-Ring Replacement Sta-rite Pool and Spa Pump Diffuser o-ring is design replacement Fits Pentair Sta-Rite Dyna-Pro/Dyna-Pro E, Dyna-Glas/Dyna-Max, Max-E-Pro, Max-E-Glas/Dura-Glas, Max-E-Glas II/Dura-Glas II Series pool and spa inground pumps Also fits Pentair Sta-Rite Dyna-Wave, Dyna-Jet TPE pool and spa pumps This product also fits with Pentair Sta-Rite IntelliPro VS pool and spa inground pumps model 3050 Measures 3-inch length by 1/4-inch height by 3-inch width