Invest in the stainless steel non-return valve for your kitchen and bathroom exhaust ducts to enjoy a cleaner and more pleasant home environment. This valve is designed to prevent the backflow of air , ensuring that your living spaces remain fresh and comfortable. Its durable construction and easy installation make it a practical and effective solution for any home. Features -Color:Silver -Material:Stainless Steel -Size:14.50X14.50X4.50cm/5.70X5.70X1.77in -Size:10.00X10.00X4.50cm/3.93X3.93X1.77in -Wideranging use: suitable for dryers, extractors, range hoods, and other hvac applications, ensuring broad usability across various systems -Backflow prevention: features a check valve design that effectively prevents backflow of smoke , maintaining a clean environment -Userfriendly installation: designed for simple installation, making it ideal for use in both kitchen and bathroom range hoods without the need for help -Silent performance: engineered for quiet operation, ensuring no noise disturbance during use, providing a peaceful home environment -Adjustable valve for airflow: equipped with an adjustable valve to accommodate different airflow requirements, offering flexibility and optimal performance Package list: 4 pcs x 1pcs valve