5 duckbill valves. Use with Medela Breastshield, Spectra Breastshield and Nenesupply Breastshield. Replacement for Medela Valve and Membrane and Spectra Valve;Designed for these breastpumps: Spectra S1, Spectra S2, Spectra 9 Plus, Spectra Dew 350, and All Medela breastpumps, except Medela Freestyle. See photo for compatible breastpumps.;One duckbill valve replaces a Medela valve and a Medela membrane. No need to buy membranes. Fewer pump parts to wash, sterilize, and assemble.;Same or higher suction power than original Medela pump parts or Spectra pump parts. Every batch is tested by independent labs for quality and safety.;Materials do not contain any BPA. Can be sterilized in water steam or boiling water. Comply with EU regulations for materials that contact food.