I think that you are correct. The valve is an SM 20-2, which is product number 261152 and goes to an FNS DE filter. It takes 2" plumbing, and the part number for the gasket is 271148.
"261152 2 in. MPV, for FNS, FNS Plus & NSP filters [SM 20-2], 7.5 in. Centerline.
271148 Spider gasket diverter, 2 in."
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