| 摘要 |
A hydrovac wand is provided with a crossfire nozzle arrangement that reduces thrust to the wand operator, and that has a spray pattern that eliminates spray bac k. A pair of jets erode a hole while two other jets push the debris back to a suction hose. Tw o high pressure swivels are provided at the end of the wand to allow the wand to rotate in a ll directions without binding. Boom controls are placed on the wand to maximize digging rates
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