Application field: ventilator Advantage ：
1. Our duckbill anti-reverse valve is light in weight, takes up a small space, and only needs a simple valve chamber
2. The valve is anti-corrosion and anti-wear, self-cleaning and easy to install
3. The functionality of the duckbill valve can be 100% tested
4. The assembly parts required by the duckbill valve are very simple, so it is more reliable in actual use