Package includes two white duckbill valves
Duckbill valves are for use with the Spectra S2, S1, 9Plus, M1, and DEW 350 breast pumps
Duckbill valves replace Spectra Valve & Membrane Set
Duckbill valves produce the same functionality as the Spectra Valve & Membrane Set
All of Spectra Baby USA storage containers and parts that come in contact with breast milk are BPA/DEHP free.