Hydro Excavators (HE) are used mostly for pot holing or trenching to locate underground services such as gas, electricity, sewer, communications and fibre optics.
Basically a HE machine uses an oversize vacuum pump or blower to generate heaps of air flow.
The dirt or material is dislodged using a high pressure water jet and then it is picked up using the huge air flow generated by the vacuum pump or blower.
VTS currently build only one type of machine based on a DAF LF55. It is 4000lt capacity, 1200cfm blower, has 2000lt of water with a 4000psi 30lpm water pump.
These are custom built to order and not generally stocked.