Features APPLICABLE RANGE: The exhaust valve is designed with a special reducing ring, suitable for most range hoods, and the applicable flue diameter is 150‑180mm. EASY OPERATION: Just open the check valve, automatically open the smoke exhaust through the exhaust wind, and close by gravity and its own spring. GOOD SEALING: Gravity sealing on the inclined surface, the oil smoke does not flow back, with back plate sealing strip, close to the wall without gaps. DURABLE MATERIALS: Stainless steel strong spring ensures quick sealing after exhausting smoke, and the silicone sealing ring fits tightly without leaving gaps. EASY INSTALLATION: The check valve main body and the fixed holder can be disassembled and separated, faster and more convenient in installation. Specification: Item Type: Air Exhaust Valve Material: ABS, Stainless Steel, Silicone Applicable Flue Diameter: Approx. 150-180mm / 5.9-7.1in Package List:1 x Exhaust Valve2 x Cable Ties1 x Drill Rod Package List 1 x Exhaust Valve 2 x Cable Ties 1 x Drill Rod