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This product ensures the correct air gap for all float-operated piston valves and helps prevent back siphonage into main water supplies. It achieves this by enlarging the air gap between the tank's 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. Sold in several sizes, it fits the following dimensions: 3/4", 1", 1.1/4", and 1.1/2" with corresponding adaptors. Made from high-quality material, it is ideal for brass piston-operated ball valves. Includes JTM 5/16 Inch Drop Arm & Adaptor with 18 Inch Drop.. JTM 5/16 Inch Drop Arm & Adaptor with 18 Inch Drop Gold Brass JTMPlumbingLim38037