The dual-opening check valve is crafted to fit seamlessly into exhaust ducts, providing a secure and efficient way for preventing unwanted backflow. Its sleek design ensures it integrates well with various kitchen appliances, particularly range hoods, enhancing the overall efficiency of your ventilation system. Features -Color:White -Material:Plastic -Size:13.50X13.00X13.00cm/5.31X5.11X5.11in -Suitable for 75-110mm diameter exhaust pipe -Backflow prevention: the dual flap check valve design ensures efficient prevention of backflow, safeguarding your range hood -Quick setup: installation is straightforward, requiring only the connection of the check valve to the exhaust duct - durability: constructed from plastic, this valve is designed to withstand prolonged use without damage -Wide usage: ideal for various settings including home kitchens, bathrooms, and other ventilated spaces -Fresh environment: the valve prevents the intrusion of outdoor smells , maintaining a clean and fresh kitchen atmosphere Package list: 1 x check valve