Replacement Duckbill Valves Silicone Membrane Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Accessories Spectra Valves Replace Not Original Spectra Pump Parts(6 ct White) *Each duckbill valve is one-piece making it easier to clean and lasts longer. Clean in water steam or boiling water *Duckbill Valves are made of silicone,can be ensure a sturdy grip on small, medium, large, or x-large breast flanges. *Not original Spectra pump parts. compatible with spectra s1, s2, Motif luna, compatible with Ameda Mya and Mya Pro. *Increase suction and provide better output during Breast Pumping sessions while preventing backflow contamination.