When a user sets up their pressure washer it is a good idea to prime the pump before each use. The easiest way of doing this is to connect the supply hose & pressure hose and wand. Turn on the supply hose and hold your hand on the trigger until all air is expelled from the system, you will expect to see a consistent flow of water out of the wand. The user than can continue to use their pressure washer as normal without fear of cavitation or running dry and therefore extending the life of the pump.