Compatible Models 4 x Replaceable silicone membrane for Spectra S1 Spectra S2 and Spectra 9 Plus breast pump 8x Replaceable duckbill valves for Medela and Spectra pump Compatible with Spectra S2 Spectra S1 Spectra 9 Plus Spectra Dew 350 and Medela breastpumps EXCEPT Medela Freestyle Sonata and Swingmaxi Same Suction as the Original We have tested that our duckbill valves and membranes are the same suction power as the as the original one Designed to replace the breastpump duckbill valve and silicone membranes every 36 months Less Parts to Wash Onepiece design Save money and fewer pump parts to wash sterilize and assemble Easy to Remove The duckbill valve is specifically designed and equipped with a easy grab pull tab that you can detach and replace the Spectra duckbill valve or medela valve easily Material Foodgrade Silicone BPADEHP free Comply with EU and US regulations for materials that contact food Please note This is an aftermarket product produced by Papablic Inc Papablic has no affiliation with or endorsement from Medela or Spectra