Attach a large metal washer temporarily to the end of the low-voltage cable that will run to the power unit. The washer gives the cable weight to let you drop it through the wall and fish it through the outlet hole. Remove the washer once you retrieve the cable. A low-voltage cable will connect each vacuum outlet to the power unit in the basement, carrying an electrical signal when the hose on the power head contacts terminals in the vacuum outlet. Follow the manufacturer's recommended wiring plan, either wiring the vacuum outlets in parallel or "home running" an individual cable from each of the outlets to the power unit and attaching them as required.
