I'm a bit confused. I'm interested in your extension cord product Code: PC83EXT25 for use with my welder and other 220 volt power equipment. but the electrical couplers don't make sense to me. 8 gauge wire will support up to 50 amps of current but the extension cord ends as manufactured on this product look like they are only compatible with 15 or 20 amp 110 volt receptacles and not.30 tp 50 amp 220 volt receptacles. Can you shed any light on this quandary for me? Thank you, Bill