Hayward Filter O-Ring | GMX400F Hammer-Head Includes: 50 lb Bag of

Includes: 50 lb Bag of Polished Lava Rock

Ideal for retrofit or new-install projects

The 605-4370 plunger and cap assembly is designed for 1-inch on-off valve configurations

Replacing the face plate restores proper sealing and maintains a clean finish

Including the manufacturer SKU K18

Hayward Filter O-Ring | GMX400F Hammer-Head Includes: 50 lb Bag ofWhat This Part Is Used For The Hayward GMX400F O Ring provides a sealing surface for compatible Hayward filter or valve assemblies. It prevents water leaks at connection points. Why This Part Matters A worn or flattened O ring can cause air leaks, water seepage, or pressure loss. Replacing it restores proper sealing and system integrity. Small sealing components play a major role in overall equipment performance. Key Features and Specifications