Handle Multiport Valve 621451 Sand Filter WatercoUpgrade your WATERCO sand filter with the Handle Multiport Valve 621451. This replacement handle is engineered for WATERCO S500S700 and T400T600 filter assemblies, delivering a dependable, smooth operation across all valve positions from backwash to rinse, waste, recirculate, and filter. The 40mm valve size ensures a precise fit with compatible WATERCO multiport valves, so you can restore reliable control in moments. Compatibility and Fit Designed as