This high limit switch is designed to use with Pentair Sta-Rite Max-E-Therm pool and spa heaters electrical system and also compatible with Pentair MasterTemp pool and spa heaters electrical system.

Replacement High Limit Switch (135°F) - Pentair, Sta-Rite, MasterTemp, Max E Therm Replacement part Pool Heaters - Replacement for 42001-0063S & STA-151-6255 - Compatibility: Pentair MasterTemp (All Models) & Max-E-Therm - Models SR200, SR333, SR400