Keep your breast pump performing at its best with the Silicone Diaphragm Valve for Momcozy S9 Pro & S12 Pro breast pumps. Designed for reliable suction and efficient milk expression, this replacement silicone part helps maintain optimal pump performance while preventing milk leakage. Made from BPA-free, food-grade silicone, it is safe for both mother and baby, easy to clean, and simple to replace as part of your regular breast pump maintenance routine. Compatible exclusively with Momcozy S9 Pro and S12 Pro wearable breast pumps.