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The product ensures the correct air gap for all float-operated piston-type valves. It minimizes the risk of back siphonage into the mains water supply by expanding 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 sizes 3/4, 1, 1.1/4, and 1.1/2", all with varying adaptors and an 18-inch drop. It is made from high-quality materials and is suitable for brass piston-operated ball valves. The product is sold in a range of sizes to fit specific requirements.. JTM 7/16 Inch Drop Arm & Adaptor with 18 Inch Drop Gold Brass JTMPlumbingLim38038