Allows for smooth airflows while avoiding backdrafts, ensuring efficient ventilation and avoiding smell from spreading This check valves is designed for easy installation, saving time and effort Just connecting it to the ventilation pipe, and it is ready to use Make from PVC, this check valves ensures durability and long terms This check valves is a versatile solution for maintaining proper airflows and controlling the direction of ventilation Suitable for various exhaust systems such as homes, offices, garages, and industry, Manufacturer: Xjdzineq