The tank is 4 inch black PVC, the hose is the clear plastic stuff, all the fittings are plastic. On top is a 2 gallon gas can, it is the return/recovery tank, it feeds from the bottom to the pump, the pump pushes the solution into the microwave and through some coils of plastic pipe (wound on a piece of the 4 inch PVC) and out to the left end of the tank, the other end has a drain with the plastic pipe sticking up to the level I need in the tank, when it fills to that level it runs back down the drain hose into the recovery tank. I have discovered that when you heat the parkerizing solution it will participate out little string like particles when you get it too hot, this happens when it contacts the hot part of a metal pan while you are heating it. Using the microwave it never touches any thing hotter than the liquid, so I avoid all the little white junk floating around in my tank. When I tun off the pump all the liquid drains back down the feed hose and ends up in the recovery tank. Larry
