Pentair WC119-87 V-Clamp with Knob Replacement Sta-Rite Pool and Spa Filter/Valve V-Clamp with knob replacement Fits Pentair Sta-Rite high-rate Cristal-Flo and Waterford pool and spa sand filter systems Also fits multiport 1-1/2-inch valves Measures 9-1/4-inch length by 3/4-inch height by 9-1/4-inch width