Remember P.A.S.S. stands for Pull the pin, Aim the nozzle,Squeeze the handle. Sweep the flames left to right at the base of the fire. Biggest mistake people make when discharging a extinguisher is not using the right technique. They usually hit the flame up high. Definition of ABC on a extinguisher, A is for ordinary combustibles, B is for flammable liquids, C is for electrical and lessor know is D for metals.