Southwire (By-the-Foot) 6/3 600-Volt CU Black Flexible Portable Power SOOW Cord 55809299 - The Home Depot
AC WORKS NEMA 6-20 20A 250V 10-ft 10 / 3-Prong Indoor/Outdoor Soow Super Heavy Duty General Extension Cord in the Extension Cords department at Lowes.com
6/3 SOOW 6 Gauge Portable Power Cable Cord 600 Volt, Non-UL