AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering An impeller is useful because

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

The 1 inch slip connections help preserve the intended plumbing and assembly relationship

Waterway Econo eyeball fitting

and control response

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

AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering An impeller is useful becauseThe 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