03 Ago NEMA L21-30P to 460C9W Plug Adapter – 1 ft 30A/208V 10 AWG – Iron Box #IBX-32412
L21-30P male plug to 460C9W female connector. - Uses Pass & Seymour plug/Cooper 460C9W connector. Allows you to plug a device with an L21-20P plug into a L21-30R outlet. Manufactured in Raleigh, NC....