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Theres a few different ones you can choose from to power a float tube. One is the powertube which should be the first photo. They're website is
http://www.powrtube.com. The second one is made by BW Sports and is called the BW Sports Power Tube. They are about $100 and if you do a google search for them, you find numerous places to buy them. I never used either of these. The only one I used was the power float which was rotomolded like a kayak. It is no longer made, and I have tried for the last few years to find the guy that used to make them and nobody knows where he is now. Anyway, hope these help and if you get a photos or two of you in your float tube, please remember us over here. TC&TL,
Perry