Potassium bicarbonate Purple K dry chemical stored pressure fire extinguishers are designed for use on high hazard types of Class B and C fires. Purple K is generally superior to other dry chemicals on Class B fires, ideal for industrial and commercial sites where flammable liquid or gas fire risk exist. Extinguisher has a chrome plated brass valve, stainless steel handle and lever, steel cylinder and internal siphon tube, large loop stainless steel pull pins with tether, heavy-duty hose with plated brass hex fitting. UL Listed and USCG Approved.