Usage Tips:Compatible Models: Replaceable duckbill valve for Medela and Spectra pumps. Compatible with Spectra S2, Spectra S1 breast pumpsSame suction power as the : We have tested our duckbill valve to have the same suction power as the Spectra and Medela valves. Designed to replace the breast pump duckbill valve every 3-6 months.Fewer parts to clean: A Papablic duckbill valve replaces the Medela valve and Medela membrane. Save money and reduce pump parts to clean and assembleEASY REMOVAL: This duckbill valve is specially designed with an easy-to-grip pull tab that allows you to easily remove and replace a Spectra or Medela valveMaterial: Food grade silicone, BPA/DEHP freePlease Note: This is an aftermarket product manufactured by Papablic Inc. Papablic is not affiliated with or endorsed by Medela or Spectra.