These work well as far as suction goes, but I do have trouble with them because they do not break down very much. You cannot detach the flanges, and for me, that is a problem because they don’t work with my pump bra. My pump bra only has a hole opening for the neck of the flange to fit through and without it detaching, it doesn’t fit. I also find they don’t seal as tight to the bottle. They work, but just not super well for my pump set up.
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