This is a genuine OEM replacement part used with many impact wrenches. The reverse valve knob is fastened to the bushing in the motor housing assembly, assisting with the direction of the drill bit. This metal item is sold individually, and a hex key is often used for making the replacement.
This is a genuine OEM part. The Ingersoll Rand reverse valve knob screw is compatible with the 231C 1/2" Drive Air Impact Wrench. The metal screw fastens the reverse valve knob onto the housing, and is sold individually. You will need a hex key for the repair.