Hayward SPX5500K Strainer O-Ring

What This Part Is Used For
The Hayward SPX5500K is a strainer O-ring used on compatible Hayward pumps. It seals the strainer housing lid area so the pump can hold vacuum, prime properly, and circulate water without pulling air. This O-ring sits in the lid or housing groove at the pump basket.

Why This Part Matters
A flattened or dry O-ring is one of the most common causes of a pump that won’t prime or that shows air bubbles in the strainer lid. Air leaks on the suction side reduce flow, hurt filtration, and can cause heaters and salt systems to behave poorly. Replacing the correct O-ring restores a tight seal and stabilizes circulation. This is an easy, high-impact fix during spring startup and routine pump service.

Key Features and Specifications

• Manufacturer part number: SPX5500K
• Strainer O-ring for compatible Hayward pump strainer housings
• Seals the pump lid area to prevent air leaks
• Helps maintain prime and stable circulation
• Common service replacement for worn or flattened pump lid seals

Installation and Fitment Guidance
Turn off power to the pump and relieve any pressure before opening the lid. Clean the O-ring groove and seat the O-ring evenly so it does not pinch when the lid is tightened. Confirm by manufacturer part number before ordering.

About the Hayward Brand
Hayward builds a complete residential pool equipment ecosystem including pumps, filters, heaters, automation, cleaners, chlorination systems, and service parts. Their pumps commonly pair with Hayward filters and heaters, so consistent suction sealing is critical for overall system performance. Service parts like O-rings help keep equipment running reliably without major replacement. Hayward replacement parts are widely supported across the pool industry.

Common Service Context
Techs typically replace strainer O-rings when a pump won’t hold prime, the lid shows bubbles, or water weeps around the lid during operation. It is often found during spring startup after the lid has been opened and the old seal no longer seats properly.