I have two sets of cups for my s12 pro. One is the set they came with the other is a replacement from Amazon. Both sets I’ve been having issues with leaking even if I double check the seal. I’m getting fed up!
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Can you tell where it’s leaking from? I have this pump as well and haven’t had any leaking issues.

if I move with the S 12 too much, the suction cups pull back and it can remove the seal and causes leaks. I’m not hugely impressed with the S2 because of this too.