Iron Box NEMA 6-20P to L6-30R Plug Adapter - 1 Foot, 20A/250V, 12/3 SJOOW IBX-5903-01 NEMA 6-20P Plug NEMA L6-30R Connector (Heavy Duty Hand-terminated) 1 Foot Length 20A, 250V 12/3 SJOOW Wire