Sodium bicarbonate extinguishing agent. Used to fight flammable liquids and electrical fires(Types B and C). Corrosion resistant metal valve and trigger, large, easy-to-read pressure gauge. U.S. coast guard approved when used with included plastic mounting bracket with strap. 4.31" length x 4.06" width x 12.69" height. Rated 5-B:C. Meets UL standards. Boxed.