Not sure buthope someone else can help :)
Quoting goddessmom3113: if anything, i had two different ones before and seem to work on me differently.
It's important to research and then find one that works for you. The lactation consultant recommended I use a hospital grade pump for the first few months because I was going to pump. I only used it for the time I was in the hospital and just used the at home pump - medela. It worked great for me.
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