Some breast pump accessories do need replacing regularly to maintain performance. If you notice that your pump seems to have lost suction, the first thing you should do is take a look at your parts, particularly the valves, and inspect for wear, fraying, or stretching and replace if needed.
Diaphragms, Duckbill Valves, and Flanges: Recomm...
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Both flanges already broke and the Momcozy support staff are not responding to my emails for replacement flanges given the parts are still within warranty.