Pentair 14971-SM10E12 Spider Gasket Replacement Sta-Rite 1-1/2-Inch MultiPort Side Mount Pool and Spa Valve Spider gasket replacement Fits Pentair Sta-Rite 1-1/2-inch multiport side mount pool/spa valves Measures 5-1/2-inch length by 1/4-inch height by 5-1/2-inch width