GearIT 50 Amp to 30 Amp RV Adapter Cord, 50Amp Male to 30Amp Female, NEMA 14-50P to NEMA TT-30R, STW 10 Gauge Heavy Duty Electrical Adapter Power Plug - 18in, 1.5ft

Does the job and does it well. Very sturdy construction. Should last a lifetime with a minimum of fuss and bother.

Good

This is exactly what I needed for a great price. By far the cheapest I found. Delivered quickly as well.

I use this with a 9500 watt generator to run my shop when Edison kills the power. Not only to power the shop with a walk-in freezer. But my well pump, transfer pump and electric water heater.