Hayward C-Spa XI Thermostat Knob Black (CZXTSK2003) calvertengineering Helps maintain one-way flow in

Helps maintain one-way flow in compatible line systems

A focused kit like this is especially useful when the valve body remains serviceable and the weakness is clearly concentrated in the lid area

An internal like this is useful because it restores both the user-facing directional jet pattern and the visual trim surface in one version-specific replacement part

Helps restore the cleaner water-supply path with a more complete hose replacement

Includes venturi air bleeder and O-ring

Hayward C-Spa XI Thermostat Knob Black (CZXTSK2003) calvertengineering Helps maintain one-way flow inThis black thermostat knob is a replacement control part for compatible Hayward C Spa XI heater applications. A damaged or missing knob can make temperature adjustment difficult and reduce usability at the equipment pad. Replacing it gives the control panel a cleaner, more functional feel during routine operation. Replacement thermostat knob for compatible C Spa XI heaters Helps restore manual temperature adjustment Black finish for matching control