Metallic 3" Non Return Foot Valve

Backflow Prevention: It functions as a flat check valve, preventing water from flowing backward into the source when the pump stops. Maintaining Prime: By trapping water within the suction hose, it ensures self-priming gasoline or diesel engine water pumps stay primed for the next startup. Debris Filtration: The bottom section (obscured here, but visible in similar models) features a built-in basket strainer to filter out leaves, pebbles, and impurities.