I ran home, changed the plastic flap and, lo and behold, "Houston we have suction!" Pfiuuuu!
Mamma's Tip: Bring spare parts with you at all time when dealing with electronics on which you depend!!
Medela Breast Pump review: although I have a love/hate relationship, the pump has turned out to be quite good. It better, right? since it costs $300. Nevertheless, it is a good product. It carries like a work bag and no one knows that I carry a breast pump with me. It is fairly roomy so I can also carry in it my wallet, keys and cell. If you buy it at Babies R Us, you can use the coupons that they have and save a whole bunch. Mine, with all the coupons, came down to $160. Anyway, I give it four stars! Happy pumping!