Matt, Aquatik makes a couple of models. I think the one with the cover is an 200-S or something like that. Mine is the 100-S. It's like the system on the back of the MC's on another thread here, and here's a link to what you get (plus a pump and a couple of fittings):
http://www.fluidconcepts.net/Pages/Showers/showers.htm After seeing the slick home made job that is pictured in still another thread here, that route is worth considering. The guy found a way to do it for under $100, using the same pump that comes with the Aquatik.