8/3 SOOW SOO SO Black Rubber Cord Outdoor Wire Cable Flexible Wire/Cable - Wire Wire Electric Supply
8/3 SOOW Portable Cord 600V Non UL (8/3 SOOW Cable, 25') - Amazon.com
Southwire 230 Volt Welder Extension Cord - 50 ft. 8/3 019228806 – Cyberweld
AC WORKS 50ft Super-Duty L5-30 Cord 50-ft 8 / 3-Prong Indoor/Outdoor Soow Super Heavy Duty Locking Extension Cord in the Extension Cords department at Lowes.com