· S9/S12/S9 Pro/S12 Pro Pump Parts Replacement - 6 pieces set diaphragms & duckbill valves are suitable for use with momcozy S9/S12/S9 Pro/S12 Pro breast pumps, for TSRETE electric breast pump· BPA-free, made of food grade silicone,safe,soft and odorless. The pump parts are perfectly meet your requirement when using a wearable breast pump· Easy 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 bag· The 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 container· The breast pump parts can be replaced every 2-3 months or so according to the installation and suction status of the breast pump