Pentair R172276 1/2-Inch Corrision Resistant Commercial Flow Indicator Replacement Pool and Spa Automatic Feeder Accessories Corrision Resistant commercial flow indicator replacement Fits Pentair Pool and spa automatic feeders accessory models 320, 322 and 300-29X Comes with 1/2-inch feed lines Measures 7-1/2-inch length by 2-inch height by 5-inch width