This product is a practical and professional range hood check valve. Made from great and sturdy material, wear-resistant and durable, you can reassure to use, not easy to damage, very practical. A nice kitchen accessory, very practical. Cost-effective, you can buy this practical product at an . Features - Color: Silver -Material:Stainless Steel - Size: 19.50X19.50X4.20cm/7.66X7.66X1.65in - Size(Clamp): 55.00X1.20X1.00cm/21.61X0.47X0.39in -Note:160 represents a that fits 160mm inside diameter -High temperature fuse device,free closure, such as fire, more than safety temperature,this check valve will start fuse. -This check valve is closed smoke exhaust. This check valve automatically open, indoor smoke quickly discharged from the public flue; - The check valve closes automatically to prevent smoke backfilling in the flue, and the anti-smoke, sealing gasket can fill the closed gap. -The lampblack in the public flue can be seamlessly inserted into the real material thickened, and not easy to oxidize and rust. -Each one is equipped with a clamp, and the pipeline installation is more firm and not easy to fall off. Package list: 4 x Check Valve 4 Clamp