I exclusively pump for my baby so these duckbills get a lot of use. They are just as good as the spectra ones (for my Spectra S2) and I actually replaced my Medela valves and membranes (for my Medela Symphony) with these. They work great with both pumps. They can fall off while pumping if the inside of the duckbill and where it connects to the breast shield isn’t cleaned properly. Will definitely be buying again.
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