Hayward Pump Strainer Cover O-Ring | SPX4000S Bispo Replacing the ultra fine basket

Replacing the ultra fine basket restores proper debris capture performance

This commitment to excellence makes Waterway a trusted choice for serious installations

The BIGAX36-1 designation identifies the panel for accurate selection and pairing with compatible components

The 1-quart bottle supports phosphate management as part of a broader Pro Series maintenance regimen

Hayward Pump Strainer Cover O-Ring | SPX4000S Bispo Replacing the ultra fine basketWhat 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