Compatible Models - 2 pcs repalcement silicone membranes for breast pumps backflow protectors . Breast pump repalcement parts are best gifts for Black Friday, Cyber Monday, Christmas, New Year, and Halloween! | Safe Material - Made with food grade silicone, BPA free. Note: This product is only suitable for new wearable breast pumps, not for traditional breast pumps. If you are not sure whether you can use it, you can contact us. | Regular Replacement - The Parts are recommended to be replaced every 1 to 2 months. Deformed parts can cause sucking failure or fluid leakage. | Clean after Use - The Parts need to be cleaned after each use. It can be cleaned after 5 minutes of boiling. | Assembled Correctly - Incorrect assembly of parts can also lead to no suction or leakage. Please assemble the accessories correctly.