One way to prevent moisture build up is to leave just the tubing attached to the pump and let it run for a few minutes each time after you finish pumping. The air moving through the tubes will dry any built up moisture, and prevent the problem going forward. When I dropped my plug and it cracked, they sent me a replacement plug free of charge overnight delivery. I agree they have great customer service!
Re: Medela FYI
**DD1 - 7/9/98**
**DS - 11/9/00**
**DD2 - 4/30/13**