Two 30-amp plugs on heavy-duty 17"L UL approved cords supply power to a 50-amp receptacle from any combination of two 30-, 20- or 15-amp power receptacles. One 30-amp connection and one 20-15-amp connection (with included adapter) on separate circuits is the ideal situation for running both air conditioners. For providing 20-15 amps on each leg an additional #24493 30-to-15-amp adapter (sold separately) is required. Receptacle is housed in a weather-proof box with flip cover and works best if outlets are on separate circuits. Polarity check of each park receptacle is recommended before use-see #16036 Good Governor (sold separately). Not for use with GFI receptacles.