Made of food-grade silicone material, this BPA-free diaphragm and valve from Momcozy are the perfect accessories for your S9 Pro/S12 Pro breast pump. Rest assured that all pump parts that come in contact with breast milk are BPA-free, giving you peace of mind about your baby's milk. The diaphragm helps maintain a seal to prevent milk leakage while the valve efficiently drains milk to the bottom of the container. Trust Momcozy for quality, safety, and convenience for you and your baby.