Feature: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 ValveMaterial: ABS.Package List:1 x Range Hood Check Valve2 x Accessories