Foot check valve is suitable for suction lines on top-offtake tanks (where an anti-siphon valve is not present). Brass valve body, with NBR sealing disc. The check valves are uni-directional; in the sense that they manage the flow in one direction only, which is indicated by the arrow on the body. These foot valves are often used in dispensing pump systems, particularly with Centrifugal pumps, to prevent the pump from de-priming during rest. Suitable for use with water, oil, diesel, and many other none toxic acid free fluids.