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The product ensures the correct air gap for float-operated piston type valves, effectively minimizing back siphonage risk into mains water. It enlarges the air gap between the tank water level and the valve outlet when closed. The drop arm should not be long enough for the float to swing under the valve body. It is available in several sizes: 3/4" - 5/16", 1" - 7/16", 1.1/4" - 9/16", and 1.1/2" - 9/16". It is made from high-quality materials and is ideal for brass piston-operated ball valves. The JTM 9/16 Inch Drop Arm & Adaptor features a 12 Inch Drop. This product is both functional and reliable.. JTM 9/16 Inch Drop Arm & Adaptor with 12 Inch Drop Gold Brass JTMPlumbingLim38039