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