国产亚洲精品美女久久久久,亚洲国产精品隔壁老王,国产69精品久久久久观看软件,春药高潮抽搐流白浆在线观看

Function: control fluid flow in one direction to prevent reverse flow, used in fluid system to prevent reverse flow of fluid. Turn it on and off.

Products are widely used in hydraulic station, fluid control and detection system, one-way open, to prevent the fluid medium countercurrent. Simple operation and installation, with high reliability.

Products can be customized according to customer requirements and working environment.