silicone rubber duckbill one way check valve stopper for Liquid and Gas Backflow Prevent * When installing the check valve special attention should be paid to the direction of flow of the medium and the normal flow direction of the medium should be consistent with the direction of the arrow indicated on the valve body otherwise the normal flow of the medium will be cut off. Opening the pressure is small generally open 1-5KPA pressure liquid or gas it can open, good sealing Easy to install.
