It contains a trigger that activates a small water pump. The pump is linked to a plastic tube that draws the cleaned liquid from the reservoir’s bottom. 泵迫使液體進入狹窄嘅腔室，然後透過噴霧器噴嘴上嘅小孔噴射. 呢個洞, 或噴嘴, 收集液體以產生濃縮流. 液壓泵係該設計中唯一複雜嘅部件, 但它的構建都非常簡單.
Its main moving component is a piston contained within a cylindrical hydraulic chamber. There is a small spring in the hydraulic chamber. To start the hydraulic pump, it must be pulled back, allowing the piston to advance into the hydraulic chamber. When the wrench is released, the piston is pushed out of the hydraulic chamber because the piston moves compress the spring. A complete pump cycle is formed by two piston strokes into and out of the hydraulic chamber.
