Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) horizonventures Installing the proper Pentair fitting

Installing the proper Pentair fitting can help restore the wall connection with better fit and a cleaner finished appearance

Helps restore secure snap-in attachment

even a modest drop in performance can make the spa feel less dependable than owners expect

and replacing the correct version helps preserve the original movement and fit inside the skimmer body

Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) horizonventures Installing the proper Pentair fittingThis 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.