Red Clean Agent Fire Extinguisher Model HG250R HalGuard is no ordinary automotive fire extinguisher. It contains Halotron® 1, electrically non-conductive "clean" extinguishing agent that rapidly turns into a gas. Halotron® 1 has passed extensive testing by Underwriters Laboratories, and meets FAA requirements. It can be found on commercial aircraft, and is used by airport fire fighters and on the flight line. Includes mounting bracket. 2.5 lb Red Double the size and fire-fighting-power of the smaller units. Provides you with additional extinguishing force for added security.