If the duckbill valve is difficult to install, please follow the steps below:

1. Hold the bottom of the container up.
2. Insert the duckbill valve into the small hole inside the container with your thumb and index finger. 
3. Gently flick the duckbill valve to ensure it does not fall out. 

If you have any further questions regarding the eufy Breast Pump, please don't hesitate to reach out to us for assistance.