An ACDelco GM Original Equipment Distributor is a GM-recommended replacement for your vehicle’s original component. It is an assembly that contains a switching device, distributor cap, distributor rotor, and distributor shaft. The switching device or sensor provides the signal to switch the ignition coil primary circuit ON and OFF at the correct moment. This original equipment distributor has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.