Keep your pump working at its best with these authentic Medela PersonalFit Flex replacement membranes, designed to provide reliable suction and a comfortable pumping experience. Made from 100% food-grade silicone and free from BPA, they’re a safe, high-quality choice for you and your baby. This convenient 2-pack is compatible with Medela Freestyle Flex, Swing Maxi, Pump In Style with MaxFlow, and Solo breast pumps, making it easy to swap in fresh parts when needed. Since membranes naturally wear over time, replacing them every 3–6 months (or sooner with frequent use) helps maintain optimal performance—so you can pump efficiently and with confidence every time.