The Tornador® Foam Gun allows you to presoak the vehicle with clinging foam. The foam stays where it’s sprayed. As you wash the vehicle, there is a layer of light foam between your mitt and the paint and your shampoo foam won’t fall flat. The Foam Gun only works with an air compressor capable of producing 60-90 psi of air pressure. The higher the air pressure, the greater the foam generated by the gun. The unique barrel on the gun mixes the shampoo and pressurized air to create a blizzard of foam. The amount of foam is regulated by a pressure valve on the gun.