Response to Hello Rich.  Attached please find the Pac Fab Nautilus Stainless D.E.exploded parts diagram.  The Valve, Sm W/plumbing 2" P.f. D.e. (sm2-pp2) 27507-200-000 is identified as a compatible multiport replacement for the SM20-2.  The MPV SF-S Series 2" - A0553645 is also a compatible replacement for the SM20-2.  The Praher Universal Multiport Valve 2" FPT (Sand/D.E.) - SM-20-A0 will replace the SM20-2 but does not have pre-plumbed connections.

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