· 【Package Content】: Two full sets S12 pro/S9pro breast pump parts including 21mm flange*2pcs,milk collector cup *2pcs,duckbill valve*2pcs,silicone diaphragm*2pcs, linker*2pcs, wearable breast pump replacement accessories provide a soft-touch for mothers and helps with soreness and swelling· 【Compatible Model】: The Full Set Milk Collector Cup Compatible with Only Momcozy S12 Pro/S9 Pro breast pumping , Not for S12/S9 and other breastpumps ,please check your model before purchasing .Not original accessories, Made by IVARONAL· 【Closed System, No Milk Backflow】: the breast pump replacement parts are designed with dual channel anti-backflow design, gas and milk separated completely, knocking over not pollute the motor, no milk spilling and waste.The advanced closed system design ensures 100% leak-proofing· 【No Gap, Non-Leaking】:The silicone diaphragm without gap on the top , while the duckbill valve design allows breast milk to flow in one direction, effectively preventing leaks and achieving optimal suction.The soft silicone shields lay smoothly on the breast to ensure maximum comfort, and the anti-backflow and anti-overflow design provides better milk flow· 【Comfort Material&Easy Cleaning】: BPA-free made of food-grade silicone material,safe,soft and odorless,ensuring safety for both you and your baby. Washing M5 pump parts after each use with warm soapy water and rinse well.Please use boiling water/steam, with a temperature of ≤100℃（212℉）for 5-10mins