1 Foot 5-15P to L14-20R Adapter, 15A/125V, 14 AWG - Iron Box # IBX-5181-01 NEMA 5-15P Plug to L14-20R Connector 1 Foot Length 14/3 AWG, SJT Jacket Rated for 15 Amps, 125V 4-Wire allows you to energize both sides of an auto-transfer switch