Adjustable Spray Wand - Some models are equipped with an adjustable spray wand that you can adjust the spray angle by turning the tip.
Automatic Cool Down System (Thermal Relief) - Cycles water through pump when water reaches 125 - 155 degrees F. Warm water will discharge from pump onto ground. This system prevents internal pump damage.
Axial Cam - A device (cam) used to transform the rotary motion of the motor/engine into the reciprocating motion of a pump's pistons.
Detergent Injection System - Cleaning detergents are drawn into water stream to make cleaning more effective by allowing detergents to saturate the soiled surface.
GPM - A unit of measure for water flow, same as "gallons per minute."
High Pressure Outlet - Connection for high pressure hose.
HP - Same as horsepower, a unit of measure for work.
OHV - Same as "overhead valve", an improved way to control exhaust and intake valves on internal combustion engines.
PSI - A unit of pressure, same as "pounds per square inch."
Purge - A method of eliminating air from a pressure washer so that starting the engine is easier.
PW - Same as "pressure washer."
RPM - Same as "revolutions per minute." The amount of revolutions (turns) an engine makes in one minute.
Side Valve - A type of internal combustion engine that uses a conventional "L" type cylinder head with the exhaust and intake valves on the side of the engine.
Spray Gun - Controls the application of water onto the cleaning surface with a trigger.
Thermal Relief - A technique use to reduce the build-up of high temperature water within a pressure washer pump caused when the spray gun trigger is closed.
Turbo Nozzle - A device used to increase the effectiveness of high-pressure water, by spinning a narrow stream of water in a circle at a high speed.
Unloader - A device used to relieve the water pressure within the pump whenever spray flow is blocked.
Variable Pressure Control - A pressure washer feature that adjusts the water pressure to the specific cleaning task.