Unable to get a drop of milk!

I ordered this product for my wife but we were very disappointed. It does contain a lot of parts in the kit but the key for me it was the breast pump. And is unable to take a single milk tasted. We tried and tried it for two weeks, trying to do the maximum seal with the plunger, without result. A failure of the bellows should not make enough pressure. It was like throwing money out the window. I do not recommend!