I have a 3 to 4 prong adaptor that could be used to connect an electric oven or some other similar appliance. Check out the photos to get a better idea of what it is. I am not and electrician and don't know very much about this adaptor. I think the cable connecting the two plugs has 8AWG printed on it, the lettering is hard to read. The total length of the whole thing is about 17".
We are located on the Northwest side near Ina and Thornydale.