The Pentair Sta-Rite 42001-0066S igniter gasket is designed for compatible Max-E-Therm and MasterTemp heater applications where the igniter sealing point needs replacement. A gasket like this is useful because it helps support the seal around the igniter area, which can matter during heater maintenance and reassembly.Replacement is often appropriate when the original gasket is brittle, damaged, compressed, or no longer suitable for reuse after service. Installing the correct Pentair/Sta-Rite gasket can help restore a cleaner heater rebuild and improve confidence in the final assembly.This OEM igniter gasket is a practical service part for compatible Max-E-Therm and MasterTemp systems that need the right sealing component during repair. OEM Pentair/Sta-Rite igniter gasket Fits compatible Max-E-Therm and MasterTemp heater applications Helps support the igniter-area seal Useful when the original gasket is worn or damaged Supports cleaner and more dependable heater service