U.S. Seal PS-3960 Buna/Carbon Pump Shaft Seal | SPX2700SA

The U.S. Seal Mfg. PS-3960 Pump Shaft Seal is a 5/8 Inch Buna and carbon mechanical seal designed as a direct replacement for the Hayward SPX2700SA shaft seal used in MaxFlo II, MaxFlo XL, MaxFlo VS, and compatible booster pump models. This seal features a carbon rotating face paired with a ceramic stationary seat to help maintain a consistent seal around the pump shaft and prevent water leakage into the motor. The Buna elastomer provides flexibility and chemical resistance, supporting reliable sealing performance in pool and spa environments. While commonly used in spa and lower-pressure applications, the PS-3960 performs effectively when installed within proper pump tolerances. Replacing a worn shaft seal helps protect the pump motor, preserve wet-end integrity, and reduce leak-related failures.

• Direct Replacement for SPX2700SA: Designed to match the size and function of the Hayward SPX2700SA mechanical seal for proper interchangeability.

• Carbon and Ceramic Sealing Faces: Carbon rotating surface works against a hard ceramic seat to maintain a smooth, stable seal during operation.

• Buna Elastomer Construction: Flexible Buna rubber helps accommodate movement while resisting pool and spa water chemistry.

• Leak Prevention Component: Seals the pump shaft opening to reduce water intrusion that can damage bearings and motors.

• Service-Friendly Installation: Straightforward mechanical seal replacement supports routine pump maintenance and wet-end repairs.