Feature:1. Leak Prevention Design: Breastfeeding pump membrane is engineered to create a seal, effectively preventing any milk leakage during pumping sessions. This duckbill valves ensures that the milk flows down to the container at the bottom.2. Food Grade Silicone Material: Made from food grade silicone, replacement membranes and duckbill valves are safe but also soft and odorless. Suitable for nursing mothers, ensuring that it is gentle on the skin.3. Compatibility: These breastfeeding pump components are specifically designed for S21 wearable breastfeeding pump. Every part fully meets the operational requirements of your device, guaranteeing consistent and efficient performance.4. Easy Cleaning: After each use, you can easily wash them with warm soapy water and rinse thoroughly. This convenience helps ensure that your breastfeeding pump components are always ready for the next use.5. Versatile Cleaning Options: These duckbill valves and silicone diaphragm can be cleaned in several effective ways, including steam cleaning, boiling water, or microwave steam bags. This adaptability in cleaning methods ensures a clean environment for your baby's feeding needs.Specification:Item Type: Duckbill Valves DiaphragmMaterial: SiliconeApplication: for S21 breastfeeding pump.Package List:2 x Silicone Diaphragm4 x Duckbill Valves