The Aladdin O-239 is an aftermarket replacement for the Hayward SPX4000T seal plate O-ring, purpose-built for the Hayward NorthStar SP4000 series pump line covering models SP4005(NS) through SP4030(NS). Seated between the motor assembly and the seal plate, this O-ring creates the critical moisture barrier that keeps your pump cavity sealed under pressure. With an inside diameter of 9-1/2 inches, it matches factory dimensions precisely, delivering a snug, gap-free fit that guards against drips and vacuum loss throughout the pump's operating cycle.

Key Benefits

• Exact Dimensional Match: At 9-1/2 inches inside diameter, this O-ring replicates the factory seal profile, ensuring a compression fit that eliminates air ingress and water escape.
• DIY-Friendly Replacement: Sized and shaped for drop-in installation, allowing homeowners to complete the swap with basic tools and no specialized training.
• Resilient Under Harsh Conditions: Formulated to resist swelling, hardening, and cracking caused by prolonged exposure to chlorinated water, heat, and pressure cycling.
• Safeguards Pump Components: A properly seated O-ring prevents moisture from reaching the motor shaft area, reducing the risk of bearing corrosion and electrical issues.
• Scheduled Replacement Recommended: Swapping the seal plate O-ring at regular intervals is one of the most effective ways to sustain trouble-free pump operation season after season.

Specifications

• Brand: Aladdin
• Part Number: O-239

SEO Tags

aladdin hayward northstar pump seal plate replacement o-ring
O-239
hayward northstar pump seal plate