The Air Knife 3L is an accessory for AutoBox 3L tractors designed to improve hose traction in oily, greasy, or sticky applications found in industrial cleaning environments like tube bundles, heat exchangers, condensers, and evaporator cleaning. The Air Knife sits between the tube face and the AutoBox, blowing a continuous "œblade" of pressurized air across the hoses before they retract back into the tractor. Keeps effluent out of the equipment, preventing performance issues and increasing component life.