Maymom Wide Neck Pump Parts for spectra S1/S2 Pumps; Incl Wide Mouth Flanges, Valves, Membranes; Not Original Spectra Flange; Replaces Spectra Duckbills, Spectra Shield (Flange 19 mm, FVM) Go to amazon.com Related posts 10 best spectra s1 flange for 2022