COMPATIBLE MODELS: 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 Swing-maxi..SAME SUCTION AS THE ORIGINAL: We have tested that our duckbill valves are the same suction power as the Spectra and Medela valves. Designed to replace the breastpump duckbill valve every 3-6 months..LESS PARTS TO WASH: One Papablic duckbill valve replaces a Medela valve and a Medela membranes. Save money and fewer pump parts to wash, sterilize, and assemble..EASY TO REMOVE: This 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: Food-grade Silicone, BPA/DEHP free, Comply with EU and FDA 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.