NENESUPPLY REPLACEMENT 4 VALVES AND 8 MEMBRANES FOR MEDELA BREASTPUMPS. Use with Medela Pump In Style, Swing, Symphony, Lactina, Mini Electric and Harmony.;COMPATIBLE AND INTERCHANGEABLE WITH MEDELA PUMP PARTS, Medela Valves, Medela Membranes, and Medela Breastshields. All parts made by Nenesupply.;MATERTIALS DO NOT CONTAIN ANY BPA. Can be sanitized with MICRO-STEAM BAG, boiling water or water steam. Made from the same materials as Medela Replacement Parts.;SAME SUCTION POWER AS MEDELA BREASTPUMP PARTS. When assembling, follow assembly instructions strictly to ensure optimal suction.;FDA REGISTERED MEDICAL DEVICE. Comply with EU Commission Regulation for plastic materials that contact food. Each batch tested by independent lab for quality and safety.