Medela's PersonalFit Flex™ Connectors offer a closed system for your new Medela Pump in Style with MaxFlow™, Freestyle Flex, and Swing Maxi Breast Pumps. Large openings and fewer parts were designed to make cleaning easier. Great as a spare set or replacement for worn or damaged connectors. Attach to PersonalFit breast shields (sold separately), which allow you to personalize your flange size. Only Medela offers replacement connectors tested and designed to work with your Medela breast pumps.