Shuttle valves are stop valves with two inlets and one outlet. There is a ball in the inside of the valve, which can travel from one inlet to the other. It will automatically block the one inlet with the lower pressure. This way the higher inlet pressure is automatically led to the outlet port. The version type WV, which is for pipe connection, is integrated in a T-shaped standard pipe fitting. The version type WVC is designed as a screw-in valve.