A-B1798182-AI SWITCH-KEYOne New Aftermarket Replacement Switch Key Fits Briggs and Stratton (B&S) Small Engines This aftermarket replacement switch key controls engine ignition on Fits Briggs and Stratton small engines used in lawn mowers, snow blowers, and other outdoor power equipment. The key switch provides start, stop, and run functions at the controls assembly, and is a direct fit replacement for the original ignition switch key on compatible engine series.