Response to Hello David.  The Diverter Gasket (Spider Gasket) part number for the Pentair - Praher Multiport Valve 1 1/2" & SM -10 is 271104.  Diverter Gasket, 1-1/2" (G-416) - 271104.  It is recommended that RTV Silicone be used to secure the Diverter Gasket in place during valve assembly.  Clear Silicone RTV 3 Oz. (66br) - 80050   The cover 0-ring may also require replacing (recommended).    Cover O-ring    Attached please find an exploded parts diagram for the Multiport Valve.  Pentair - Praher 1 1/2" TM-12 & SM-10    Part 271141, is the label only.  (see page bottom)

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