Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) grasslin MoFlow design

MoFlow design

Helps restore electronic control and lower support

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

Proper skimmer selection matters for both appearance and circulation

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

Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) grasslin MoFlow designThis 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.