Babylove, Thanks a bunch for the reply. I did find the manual for the latest products but not my model, which I believe is an '06. I found in the manual that the newer pumps don't have this button. My pump does have the let down button which you spoke about and the letdown button is described in the manual, but there is no mention to the button I'm speaking of. This button is place above the Let Down button and is about 1/8" round and recessed from the surface about 3/8".