8/3 SOOW SO Portable Power Cord Outdoor Durable Flexible Wire Cable 600V (100 ft) - Amazon.com
8/3 SOOW SOO SO Black Rubber Cord Outdoor Wire Cable Flexible Wire/Cable - Wire Wire Electric Supply
AC WORKS 10 ft. STW 8/3 3-Prong NEMA 6-50 Welder Extension Cord WD650PR-10D - The Home Depot
Woods Yard Master 8-ft 16 / 3-Prong Outdoor Sjtw Medium Duty General Extension Cord in the Extension Cords department at Lowes.com
Philips 8' 3-outlet Grounded Extension Cord - Black : Target
VEVOR RV Extension Cord 40 Amp 50 ft. 250V 8 AWG/3C Welder Power Cord with NEMA 6-50 Plug STW Jacket for Welding RV Generator HJLJQ8-3-50FTYCX1V1 - The Home Depot