General description Replacement Intex piston valves designed for easy on/off operation for pool filter pumps. These valves are compatible with Intex above-ground pools that utilize 1.5" diameter hoses and 2.5" threaded fittings. Upgrade your old piston valves to enhance the efficiency of changing hoses and pumps. Technical specifications Compatible with filter pumps: 28635EG, 28633EG, 28671EG, 28645EG, 28647EG, 28651EG, 28677EG, and 28681EG Hose diameter: 1.5" Threaded fittings: 2.5"