Hayward
Hayward SPX4000S Strainer Cover O-Ring
Hayward SPX4000S Strainer Cover O-Ring
What This Part Is Used For
The Hayward SPX4000S is a strainer cover O-ring used on compatible Hayward pump strainer lids. It seals the lid to the strainer housing so the pump can pull suction and maintain prime. This O-ring installs at the pump basket lid sealing surface.
Why This Part Matters
A dry, flattened, or cracked lid O-ring is a common cause of air leaks that show up as bubbles under the lid and weak circulation. Suction side air reduces filtration performance and can create flow issues across the equipment pad. Replacing the correct O-ring restores a tight seal and helps the pump run steady without constant reprime. It is one of the quickest fixes for a pump that suddenly starts acting like it has a clog.
Key Features and Specifications
- Manufacturer part number: SPX4000S
- Strainer cover O-ring for compatible Hayward pump lids
- Seals lid to strainer housing to prevent suction air leaks
- Helps maintain prime and stable circulation flow
- Common service replacement during pump basket maintenance
Installation and Fitment Guidance
Shut off power and open the pump lid only when the system is off. Clean the O-ring groove and seat the O-ring evenly so it does not pinch when the lid is secured. Confirm by manufacturer part number before ordering.
About the Hayward Brand
Hayward manufactures a full residential pool equipment ecosystem including pumps, filters, heaters, automation, cleaners, chlorination systems, and service parts. Their pumps integrate with Hayward filtration and heating equipment, so suction sealing plays a big role in overall pad performance. Routine service parts like lid O-rings help prevent avoidable flow issues and downtime. Hayward replacement parts are widely supported across the pool industry.
Common Service Context
Techs typically replace lid O-rings when a pump struggles to prime, shows air bubbles in the basket, or leaks water at the lid seam. It is often identified during spring startup or after the lid has been removed repeatedly for basket cleanings.
