Air conditioners that use it come with built in capacitors. The problem is that if you don't have this little gem to help you, the heat exchangers will fill up and the pumps will fail prematurely. My particular device was the Coleman Mach and it was already installed. The device did not work for me for several years after the initial installation, but in the end it gave up - the new starting capacitor did not help - the pump does not work. I suspect this will be a replacement part.
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