The Hayward SPX4000S Strainer Cover O-Ring is an essential sealing component that ensures a leak-free fit for Hayward pool pump systems. This O-ring is the perfect fit for the strainer cover, measuring 0.5" × 7.25" × 9.75" with an outer diameter of 8-1/4" and an inner diameter of 7-3/4". The SPX4000S O-Ring, which is made of sturdy, high-quality material, forms a tight seal between th... https://www.usapoolshop.com/spx4000s-hayward-strainer-cover-o-ring