: I wanted to do this as well, but ended up putting a rule 500 cut
: into the minicell foam seat I made. It is out of the way hard to
: see and works great. I used Gnarlydogs info and the instructions
: from the company that coppied his setup and came up with a
: lithium opperated unit. The only hard thing to find is the reed
: switch large enough to switch the pump on, I found a 5amp reed
: on ebay for a few dollars.
: The pump clears the water out in less than a minute.
: You can download almost complete instructions to build one on that
: company's site that coppied Gnarleydog.
: Good day.

I did a very similar setup as well. You can use a relay if you can't find a reed switch that can handle the pump. Here's a link to my blog entry:

http://justyakkin2.blogspot.com/2010/10/lazy-or-it-just-makes-damn-good-sense.html

Sean