I could not get good suction with this model after several attempts (talking maybe 15-20 attempts) and it probably is hurting my supply in the long run. I'd normally get 5-6 ounces per pump, with these I was lucky to get half of a regular pump session. The model is weird and the valve/membrane is located on the top instead of the back like the Spectra models. The flange also comes apart at the base as well. Will go back to Spectra or May-mom as that was a reliable replacement before but thought I'd give this a try.
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