You asked: Right now the gravity works very well, so I am not sure why I need a pump
I ask in reply: What would make gravity stop working? There is a time for building and a time for FLYING and the time for building has expired. See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering
