I use the "old version" Avent pump for almost two years....it's good. Yesterday, I brought a new one. And I used it today. I found that it was very noisy ( "E ...E...sound). I need to use it in office and the sound make me feel uncomfortable! I tried to install the handle in different position but still have E E sound.What can I do? :-( :-( :-( [size=large]PLS HELP
pls try to remove the transparent cap (semi-circular shape) and the white handle, then, slightly twist the white T shape part (which is to attach the handle to the valve)