The head of the spray bottle consists of only a few parts. It has a trigger that triggers a small water pump. The pump is connected to a plastic tube that draws cleaning fluid from the bottom of the reservoir. This pump presses liquids into a narrow cavity and ejects them through small holes in the sprayer tip. This hole, or nozzle, allows the flowing liquid to gather together into a concentrated stream of water.

    The only complex in this design is the hydraulic pump, but its construction is also quite simple. Its main moving element is a piston, located in a cylindrical hydraulic chamber. Inside the hydraulic chamber, there is a small spring. In order for the hydraulic pump to run, you first pull the wrench back, which pushes the piston into the hydraulic chamber. The moving piston compresses the spring so that when you release the wrench, the piston is pushed out of the hydraulic chamber again. The two strokes of the piston in and out of the hydraulic chamber constitute a complete pump cycle. During the downstroke, the piston is pushed inward, compressing the volume of the hydraulic chamber, thereby forcing the fluid out of the pump. On the upstroke, the spring pushes the piston outward, expanding the volume of the hydraulic chamber, which draws fluid into the pump.