Pentair R172324 1/2-Inch Corrosion Resistant In-Line Check Valve Replacement Pool and Spa Automatic Feeder Corrosion resistant check valve replacement Fits Pentair pool and spa automatic feeder Comes with 1/2-inch tube by 1/2-inch tube Cut chlorinator inlet line at desired location Measures 16-3/4-inch length by 13-1/2-inch height by 16-3/4-inch width