AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering This version is a practical

This version is a practical choice when you need to keep the original threaded plumbing relationship intact

An impeller is useful because it helps drive water through the pump housing

This replacement is especially useful where the original top mount valve has failed or where the plumbing layout benefits from easier future access through the union connections

supporting safer and more dependable operation of connected equipment

and control response

AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering This version is a practicalThe AquaCal AutoPilot ST 220 fan assembly is designed for compatible chlorination system applications where internal cooling airflow is needed to support the electronics. A fan assembly is useful because it helps reduce heat buildup inside the unit, which can contribute to steadier operation and better long term component protection. This replacement is especially useful when the original fan has become noisy, weak, seized, or completely