A power sprayer pump head is the core compon- ent responsible for creat- ing the high pressure needed to propel liquid (like pesticides, herbicides, or clean- ing agents) from a tank, through a hose, and out of a nozzle, resulting in a powerful and controlled spray . It typically contains components such as pistons or diaphragms that, when powered by an engine or motor, gener- ate the pressure for efficient, uniform application over a wide area. This video explains the basics of how a pressure washer pump works: