Compatible Models: Replaceable duckbill valves for Medela and Spectra pump Parts. Compatible with Spectra S2, Spectra S1, Spectra 9 Plus, Spectra Dew 350 and Medela breastpumps EXCEPT Medela Freestyle, Sonata and Swing-maxi. Same Suction as the Original: Our replaceable duckbill valves are designed to provide the same suction power as the Original Spectra duckbill valves. Replace the breastpump duckbill valve every 3-6 months. Easy to Attach and Detach: Papablic's uniquely designed duckbill valve with an easy grab-pull tab that you can detach and replace the duckbill valve easily. Easy to Clean: Wash the duckbill valves after each use with warm soapy water and rinse well. Dishwasher safe. Material: Food-grade Silicone, BPA/DEHP 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 Spectra.