Features 1、[Secure Closure] Featuring gravity spring for a tight seal, this flue check valve prevents grease and smoke from flowing back, ensuring efficient ventilation in your kitchen. 2、[Thickened Material] Constructed from thickened ABS material, this flue check valve is heat resistant, and aging resistant, ensuring lasting use. 3、[Built in Level] Equipped with a built in level, this exhaust fan check valve ensures accurate horizontal installation without deviation. 4、[Versatile Application] This exhaust fan check valve can adapt to various scenarios, suitable for use in various kitchens, bathrooms, and other areas. 5、[Practical Tool] This exhaust check valve offers practical and effective backdraft prevention, maintaining clean and refreshing home environment. Specification Item Type: Range Hood Check Valve Material: ABS Package List 1 x Range Hood Check Valve 2 x Accessories