One of my pumps don't seem to be suctioning as it should like the other one does. Do you think this is a fault or is there anything I may be doing wrong?
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which momcozy do you have? i had the 9 and i had similar problems. i ended up getting the momcozy m5 and they are much better

I had to send the S9 back and get a replacement as the suction stopped working

it could be the motor itself or the actual duckbill. i had a few times where it would stop suctioning even though everything was in place properly. turned out the duckbill had ripped and wasn’t sucking anymore

I have the momcozy s12 Pro and sometimes they don’t suction. I find that if the diaphragm is wet, it stops them from working properly.