This valve is our special product and it is used for draining sewage.In foreign countries such as Spain or America, it is usually named as duckmouth-shaped valve. We are continuoully doing our best to make this valve more practical and more perfect.The valve can be matched with straight pipeline, flange pipe,cement pipe. At the same time, they may be widely used on the coast,seasands,reservoirs,and so on, in order to dispose the sewage or to dredge the floods. Indeed ,it is environmentally-friendly valve.