The best thing to do is remember the friggin drain lines but this work well http://www.billpeckham.com/from_the_sharp_end_of_the/2008/03/the-continuin-1.html
love that solution - would not have thought about it. Even tho if for some reason we can not do a run and are already set up, I hook the heater line to the drain line and let the bags all drain.