Knob Speed Control Old Guardian R500 4032143

Older knob for the Guardian R (units that part numbers DO NOT end in a "-1"). Not interchangable with newer switch due to mount plate differences. Knobs not interchangable. If switch has a black shaft (the part the knob tightens onto) use Knob: 104446. Switch: 104445 If switch has a white shaft (the part the knob tightens onto) use Knob: 102275. Switch: 102274