Aftermarket On-Off Toggle Switch replaces Dewalt P/N 5130221-00, MK Diamond P/N 154310, Hubbell P/N HBL21SP, Husqvarna P/N 542193885, Ridgid 44905 and Emglo/Dewalt P/N 5131519-00. Switches are commonly replaced parts in power tools. A switch handles all on/off and variable speed functions. They also have a role in electric breaking; they can momentarily reverse electrical polarity. Because switches use mechanical internals, they tend to degrade and wear out over time, eventually requiring replacement. This On-Off Toggle Switch is mainly used in MK Diamond, Husqvarna, Target, Felker tile saws & Dewalt Compressors as well. The switch includes the water tight threaded rubber cap over the toggle lever. NOTE: Some common signs of a broken or failing switch are: Tool has completely stopped functioning - it will not turn on Tool operates intermittently, requiring multiple tries to turn on, until eventually it won't turn on at all Variable speed function and electric braking aren't working properly. Compatible With: Ridgid 700 Pipe Threader