Polaris/Zodiac PB4SQ Booster Pump Motor Fan (R0723000) airswitches A check valve is useful

A check valve is useful because it helps keep water moving in the intended direction while reducing the chance of reverse flow through the line

That matters when a replacement pump needs to match the original system closely and still remain practical to maintain in the future

Matching the correct dark gray internal helps preserve intended fit and cleaner jet restoration

Helps capture and contain debris during operation

Polaris/Zodiac PB4SQ Booster Pump Motor Fan (R0723000) airswitches A check valve is usefulA motor fan helps support cooling airflow around a compatible booster pump motor, and this Polaris and Zodiac version is designed for PB4SQ applications using the R0723000 reference. Motor fans are useful because proper cooling support helps maintain dependable pump motor performance during operation. This part has practical value because a model specific replacement helps preserve the intended airflow and fit of the original motor assembly. A