Air pressurize water extinguishers or APW are types of fire extinguishers that extinguish burning material by absorbing heat . They contain 2.5 gallons of water or water with a wetting agent which is applied by means of a 1/2 inch hose with a smooth-bore nozzle attached to the tip. They produce a 40-50 foot stream of water, with a discharge time of about 45 seconds. Although only effective on only Class A fires, they have the advantage of being inexpensive, harmless, and easily refilled as well as having the advantage causing no mess, resulting in easy clean-up.