The AirLine Sprayer uses compressed air through a special nozzle to emulsify the spray. This allows previously un-sprayable products such as Udder Comfort, to be easily sprayed. But the really big benefit is this system reduces the amount of remedy used by about 20-25%. With high-value products such as Udder Comfort*, this means the AirLine Sprayer will pay for itself very quickly. This is aside from the great savings in time that the AirLine Sprayer brings. The Airline Sprayer container holds one litre of product. This is held in one hand, with the AirLine Sprayer in the other. Air pressure required is about 40 psi and volume usage is not high, so a small portable-type compressor is all that is required to operate it. A controllable regulator is supplied in the kit.