Part # 26-253-1220
Manufacturer Code SM-20-3
Alternate Part #'s PRASM203
Praher Universal Multiport Valve 2" FPT (Sand) - SM-20-3
ALTERNATE OPTION: Praher Universal 1-1/2" Multiport Valve - SM-10-3
Tune Up Kit Pac Fab 2" Multiport Valves - GOKIT70 https://www.inyopools.com/Products10/00500017069471.htm
The valve when set to filter will not seal the backwash outlet, causing a large volume of water to continue to flow out when the pump is running. I was wondering if this is easily able to be fixed or is it better to replace the entire valve
It sounds like your valve's spider gasket is damaged - part # 4600-1148 on a Pentair - Praher 2" TM22 & SM20 valve. These gaskets are relatively easy to replace. See our guide on "How to Replace a Spider Gasket on a Multiport Valve".