Arborjet Supersonic Air Knife LT LiquidThe Arborjet Supersonic Air Knife is the game changing ultra light pneumatic soil excavation tool for vertical mulching, radial trenching, bare rooting, and more! The Mach 1. 3 air separates the soil particles apart for super fast digging without harming trees, buried utilities, and sewage lines. This 'Liquid' version of the Air Knife uses the same lightweight technology of the Air Knife LT, but includes an extra garden hose connector to add water to