Has anybody tried hooking up a roller pump to a hot box. If so, what are the results. I know the chemical bandit uses a 6 roller delevan pump. that pumps up to twenty gpm. It probably uses this pump below. http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200321253_200321253 But I was wondering what results could you get if you hook up a 4 roller pump to a hot box that could handle 8 gpm. A develan 4 roller pump can pump up to 9 gpm up to 150psi. My delevan 4 rolller pump and I have seen it do 175psi. I am thinking about buying me a hot box, and using my 4 roller pump to help with my fleet washing. I already use my 4 roller pump to do fleet washing. I am needing hot water though to help degrease. I am thinking it will work. Because on the pump side of a pressure washer going to the hot box, its going wide open with no tips, so therefore the pressure is a lot lower. But is pushing gpm not much pressure. Then it goes thought the hot box, discharge from hot box, the pressure hose, to gun to tip. Tip creating the pressure. Also wondering if you could use take the output side of roller pump with has 3/4" FNPT (female national pipe threads) and get fittings to hook up the appropriate down streamer and down stream your chemicals. Just like you would with a pressure water. without having to go back and to truck and apply soap and degreaser by other means. What do you guys think. Also the house washer guys, and desk washers, if you haven't done so, you can lean a lot about pumps here from the lawn spraying guys. They use all differant pumps, roller pumps, diaphram pumps, and electric pumps. those guys have a lot to offer when it comes to moving large gpm with low pressure. The reason I am saying this is the chemical bandit is not a new design. Yard spraying guys have been using the exact same setup for many years. Even farmers have been using this pump spraying 1000's of acres of farm land for even more years I wish I would have thought about marketing and building it for house washer. The only thing differant is the gun. We lawn spraying guys use the roller pumps, because its cheaper, easier to rebuilt, less maintence then a diaphram pump.