Leaking Multiport Valves: If the valve is leaking around the external of the top its typically the cover o ring that’s right under the canopy. When water is leaking out the backwash port its usually the spider gasket also, that you can get by quickly by inserting a 1. 5″ winterizing plug with o ring and that can stop the leak but here’s just until that you could exchange the gasket. If the stem during the center is leaking there are some parts to alter on the valve stem.
There is 2 o rings and washers and on top of the valve under the handle is a plastic bearing spacer ring that helps the valve handle move easier.