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This high-quality air gap device is essential for ensuring proper air gap achievement in float-operated piston type valves, significantly reducing the risk of back siphonage. By increasing the distance between the tank's water level and the valve outlet when closed, it effectively prevents contamination of the water supply. The design includes a drop arm that should prevent the float from swinging beneath the valve body, thereby maintaining optimal function. Available in a range of sizes including 3/4 inch - 5/16 inch, 1 inch - 7/16 inch, 1.1/4 inch - 9/16 inch, and 1.1/2 inch - 9/16 inch, this device accommodates various installation needs. Constructed from high-quality materials, it is ideal for use with brass piston-operated ball valves, ensuring durability and reliability across different applications.. JTM 3/8 Inch Drop Arm & Adaptor with 18 Inch Drop Gold Brass JTMPlumbingLim38044