Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) grasslin Installing a fresh body O-ring

Installing a fresh body O-ring can help restore the pump assembly without forcing replacement of larger body components

This part has practical value because replacing a damaged casing can restore both structural completeness and visual presentation without requiring changes to the cleaner’s internal systems

Designed for compatible cleaner filtration applications

Helps restore electronic control and lower support

Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) grasslin Installing a fresh body O-ringThis thermostat is used on compatible Hayward CZ, HM, and HM2 heater systems where temperature regulation hardware needs replacement but the control knob is not required. It is a practical service part for restoring proper heater response when the existing thermostat is worn, inconsistent, or no longer controlling the system correctly. For pool and spa heaters, small control components can make a noticeable difference in comfort and reliability.