wanna a practical and check valve? If you want, then you can consider our product.This check valve is made from , not easy to break and damage, very and practical. For personal hood use or dining room use. The product is simple and convenient to use, easy to install and remove. The product has practical functions. Features - Color: Silver -Material:Stainless Steel - Size: 18.50X18.50X4.30cm/7.27X7.27X1.69in - Size: 55.00X1.20X1.00cm/21.61X0.47X0.39in -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 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: 1 x Check Valve 1 Clamp