Most retail gas powered pressure washers that you come across will be rated for 50 - 100 hours of use. This Cam Spray 4000 PSI gas pressure washing cart is rated for over 2,000 hours of use. Just like the rest of our gas powered cart mount power washers, this machine is rated for industrial work. The 4000 PSI is great for breaking down any heavily soiled surface. The pressure on the pump is adjustable, so you can turn the power down if you're just pressure washing the outside of a building and you don't want to strip the paint or blow water through the seals in the windows.