A few months back there was active discussion in this forum regarding new pump kits from one of our well known companies. It allows single to double pumping with the flip of a switch. The conversations back then had to do with very low pressures compared to the older (less convenient) kits, and Lactnetters from various locations reported problems. The company denied any defects, as I recall. Some people wondered if the kits that seemed faulty were assembled incorrectly by the user. Several of you sent me readings that you had done with your gauges that showed dramatic differences between old style and new kits. Well...I recently worked with a woman who came to see me with a minimal milk supply at 12 days pp. Her baby had problems and could not nurse initially... She had rented a full sized pump and purchased a kit when she was discharged from the hospital at 48 hrs pp. She had pumped no more than 20 mls at a session using the single or double kit, and was pumping ~12 times each 24 hours in an effort to increase her supply. Needless to say she was very discouraged because she was working so hard and still had to supplement with formula. During our consult I had her use a pump (same brand) and a disposable kit in my office and she was surprised by the efficiency of the pump. "Wow!" she said "My pump doesn't feel like this -- nowhere near." A light bulb came on in my brain when I recalled all your comments on Lactnet! When I questioned her I realized she had one of the switchable kits at home. I gave her a new kit (old style) from my stock and her milk supply increased dramatically (to full supply) during the next few days. Anyone who remembers this discussion might want to be wary of this potential etiology for women who are pumping without getting results. This kit was purchased from a station with big volume sales, so it wasn't a kit that has been lying around since last year. Margery Wilson, IBCLC