This replacement set includes a silicone diaphragm and valve specifically designed for Momcozy S9 Pro and S12 Pro breast pumps. Made from food-grade silicone, these essential components ensure proper suction and milk flow during pumping sessions. Key features: • Compatible with S9 Pro and S12 Pro models • Food-grade silicone material • Includes diaphragm and valve components • Transparent design for easy inspection • Easy to clean and maintain • Ensures optimal pump suction Regular replacement of these components is recommended to maintain optimal pump performance and hygiene. The transparent silicone construction allows for visual inspection of part condition. Both pieces should be thoroughly cleaned after each use according to the pump's cleaning instructions. The set includes one diaphragm and one valve, which are crucial for maintaining proper suction and milk flow.