Wearable Brest Pump UniversalDuckbill valves and silicone diaphragm fittings are universal for most wearable breast pumps on the market, such as the S9/S10/S12/S4DW wearable breast pumps.Duckbill Valve & DiaphragmThe diaphragm is used to help the breast pump maintain the seal to prevent milk leakage. The duckbill valve can be used to drain milk to the bottom of the container.Wearable breast pump parts replacement for milk collector sealing and anti backflow, these parts help the milk pump work effectively.Material Safety& BPA FreeThis Duckbill Valves & Diaphragms are made with food grade silicone, All pump parts that come in contact with breast milk are BPA free, giving you peace of mind about your baby's milk, Can be sanitized with water steam, boiling water or microwave-steam bags.Easy to Cleancleaning by hot water or dishwasher top rack.So easy to clean that do not worry about the bacteria hidden in the corner of the pump. Please replace the duckbill valve if you can see that the bill is slightly open after washing.