How the Water Gets to the Washer
Pressure washers are part garden hose and part air compressor. A typical pressure washer has a motor that is either powered by gasoline or electricity. This motor powers the air intake system, which builds air pressure in an accompanying tank. A garden hose hooked up to the washer provides water to a separate tank.
How Water Gets Out of the Washer
The washer is hooked to a high pressure-rated hose. At the end of the hose is a water gun that looks similar to the pressure guns used at car washes. When the trigger is pulled, the water mixes with the air and comes out of the nozzle.
At the end of each spray gun is a detachable nozzle. The nozzles are graded by the angle in which they spray. For instance, a zero-degree nozzle is a narrow, straight stream. This is the most powerful, as the water is concentrated and not spread out. As the degree increases, the pressure decreases.