Usage Tips:S9/S12/S9 Pro/S12 Pro Pump Parts Replacement - diaphragms & duckbill valves are suitable for use with for momcozy S9/S12/S9 Pro/S12 Pro breast pumps, for TSRETE electric breast pumpBPA-free, made of food grade silicone,safe,soft and odorless. The pump parts are perfectly meet your requirement when using a wearable breast pumpEasy washing, you can wash pump parts after each use with warm soapy water and rinse well. Can be washed with steam,boiling water or microwave steam bagThe diaphragm is used to help the breast pump maintain the seal to avoid milk leakage. The duckbill valve can be used to drain milk to the bottom of the containerThe breast pump parts can be replaced every 2-3 months or so according to the installation and suction status of the breast pumpColor: TransparentMaterial: SiliconePackage Contents:8 * Duckbill Valve4 * Diaphragm