Compatible with Medela Pump in Style Advanced breast pump: Not for use with Pump in Style with MaxFlow, Freestyle, Freestyle Flex, Harmony, Sonata, or Swing breast pumps
Pumping customization and efficiency: PersonalFit Connectors are made to easily attach to all PersonalFit Breast Shields and sizes, including the PersonalFit Flex™ Breast Shields
Authentic Medela PersonalFit connectors: Same connectors that came with your Pump In Style Advanced® Starter Set