Hayward Filter O-Ring | GMX400F Hammer-Head Some plumbing adjustment may be

Some plumbing adjustment may be required during installation

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

Ideal for retrofit or new-install projects

it's typically integrated into the wheel assembly to ensure even tracking across surfaces

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

Hayward Filter O-Ring | GMX400F Hammer-Head Some plumbing adjustment may beWhat 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