"This backflow valve prevents water from backing up the air line. U.S.A. Application Prevents water from backing up the air line, Size in. 5 x 2 1/2 x 8 3/4, Includes qty. 1, Compatible With Diffuser, Product Type Windmill accessory, Accessory Type Guages and valves. Critical component for diffuser airstone systems, especially in climates where temperature falls below freezing"
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