Pentair Max-E-Therm/MasterTemp Thermistor (42001-0053S) mpindustries The CMP generic weir is

The CMP generic weir is designed for compatible skimmer applications where a replacement weir door with a 7 inch width is needed

Helps maintain the skimmer area so debris capture

Manual vacuuming is cleaner and more efficient when the skimmer vacuum plate seats correctly

suffers internal wear

Threaded large-face directional scalloped design in gray and stainless

Pentair Max-E-Therm/MasterTemp Thermistor (42001-0053S) mpindustries The CMP generic weir isReplace a worn temperature sensing component with this thermistor for compatible Max E Therm and MasterTemp heaters. The thermistor helps the control system read water temperature so the heater can cycle properly and maintain the selected set point. A failing thermistor may cause inaccurate temperature readings, erratic heater operation, or diagnostic errors. This replacement is a practical option when testing confirms the sensor is out of range or