The Key Seal Assembly is the bottom section of the Key, Cover and Handle Assembly in a Multiport Valve. It contains the spider gasket that helps direct the flow of water through the filter and out to the exit ports, Return and Waste. If this gasket is damaged, it will allow water to leak into undesignated areas, like leaking into the Waste port when in Filter mode. For many MPVs like this Hayward SP-714T Valve, the spider gasket is glued into the Key Seal Assembly at the factory and is not sold separately. To replace the gasket, so must buy and replace the Key Seal Assembly This guide shows you how to replace a Hayward Key Seal Assembly. Although this guide features a Hayward SP-714T Valve, many of the steps in the procedure can be applied to most other MPVs.