The Valterra Mighty Cord 30-50A Plug Adapter, model # A10-3050A, is a space saving, compact adapter plug made to adapt 30 amp power for use with 50 amp trailers. This works by plugging the 30A male end into a 30A power supply, and then plugging your 50A device into the 50A female end. The plug is black and made from durable PVC for long use. Brand new, in stock, and ready to ship.