Product review (5 stars): Use for an extension cord for my welder in the garage.
I bought this pigtail to make an extension cord for my welder in the garage.  I plug into the 30amp dryer outlet and used a Leviton 5378 50 Amp NEMA female end to attache to my welder.  Worked like a champ. No issues, no heat, no tripped breakers.  The center wire on the pigtail is the ground.  I used a Volt-Ohm meter to confirm this.