This Mi-T-M, model AW-7020-8003, is a Rotary Surface Cleaner, 20-inch, 4000 PSI, with 3.0 to 5.0 GPM water volume. It has a heat-treated sealed pressure swivel and requires no maintenance. This is a great cleaner capable of tackling any flat surface area. It can be used with hot water, is large, lightweight, corrosion resistant, strong and has long lasting materials.