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.
BUY PARTS - For the Hayward SP414T Valve you will need to order a Key/seal Assembly (Diffuser w/ Gasket Glued In) (spx0714ca). If some of the smaller parts are damaged, you may also need to order, a Teflon Bearing Washer, one or two O-rings With Teflon Seals, a set of two Metal Washers and a Spring. If you have a different Multiport Valve, go to the parts list for your Valve.
VIEW HANDLE ALIGNMENT - Check the alignment of the handle. The front of the handle has to line up with the opening at the bottom of the valve. If the handle is not aligned correctly. your valve's modes could be 180 degrees out of sequence. You could be Backwashing when you think you are in Filter mode.