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

A properly selected Viton O-ring helps support cleaner groove fill and contributes to more dependable sealing performance where both size and compound matter

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

Key identifiers and configuration details include 1

The Waterway 672-5301 tank stand and base is designed for compatible Smart Clean and UltraClean sand filter applications

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.