Waterco Multiport Valve Spider Gasket 40mm (621460) – Suits S600 & Thermoplastic Filters

Genuine Waterco Multiport Valve Spider Gasket — 40mm, part no. 621460. The spider gasket seals the multiport valve rotor against the valve body, directing water flow to the correct port (filter, backwash, rinse, waste, recirculate, or closed). A worn or cracked spider gasket causes water to bypass the selected port, resulting in poor filtration, water leaking to waste during normal filter operation, or sand passing through to the pool. Replacing the spider gasket restores correct multiport valve operation.

Compatibility

• Waterco S600 Premium thermoplastic sand filter
• Waterco thermoplastic filters with 6-inch clamp neck ring multiport valve
• 40mm port size

Product Details

• Brand: Waterco
• Part number / SKU: 621460
• Barcode: 9314800096745
• Material: rubber (6-spoke spider pattern)
• Port size: 40mm
• Genuine Waterco spare part

Frequently Asked Questions

How do I know if my spider gasket needs replacing?

Common signs of a failed spider gasket include: water running to waste continuously during normal filter operation, sand appearing in the pool after backwashing, water leaking from the multiport valve handle area, or the valve handle not holding its position. If you notice any of these symptoms, inspect the spider gasket for cracks, tears, or deformation. A damaged gasket should be replaced promptly to restore correct filtration.

Is this gasket compatible with my Waterco filter?

Part 621460 suits Waterco thermoplastic sand filters with a 6-inch clamp neck ring multiport valve, including the S600 Premium. To confirm compatibility with your specific filter model, check your filter’s documentation or contact us with your filter model number before ordering.

How do I replace the spider gasket?

To replace the spider gasket, turn off the pump and relieve pressure from the filter system. Remove the multiport valve from the filter tank by undoing the clamp ring. Lift out the rotor assembly and remove the old spider gasket from the valve body. Clean the valve body seat, then press the new gasket firmly into place. Reassemble in reverse order. If you are not confident working on pool filtration equipment, have the replacement carried out by a pool technician.