The Hayward CX400G Filter Tank and Pump Lid O-Ring is a crucial component designed to ensure the efficient operation of Hayward's NorthStar and EasyClear systems. This O-ring, made of durable rubber, plays a vital role in maintaining a secure, leak-proof seal between the filter tank and pump lid. With a diameter of 8 inches, it provides a perfect fit for compatible systems, ensuring o... https://www.usapoolshop.com/cx400g-hayward-filter-tank-and-pump-lid-o-ring