This is a Generic Pump Diffuser O-Ring O-83 replacement with dimensions for 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. The dimensions also work with Pentair Sta-Rite Dyna-Wave, Dyna-Jet TPE pool and spa pumps, IntelliPro VS inground pump