Neverest RK 150mm Non Return Valve Pipe Fitting Galvanized Steel with Non-Return Valve Automatic Hood Rubber Seal Pipe Connector

Neverest RK DN 150 check valve 150 mm hose connection, very robust and durable.The housing is made of galvanized steel, the blades are made of aluminum.Two stainless steel springs and a rubber ring ensure 100% closing and silent closing when the exhaust fan is not in operation.Function: the ventilation hose connector with non-return valve DN150 prevents the return of exhaust air or the entry of cold outside air.The flaps open when the fan blows exhaust air outward and automatically close as soon as the airflow is cut off.The flaps should be oriented horizontally for optimal closure.'