Seachoice Trailer Adapter 7 Way Blade Round to 5 Way Flat 8" 50-13881 by Seachoice $17.57 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Seachoice Trailer Adapter 7 Way Blade Round to 4 or 5 Way Flat #50-13881 Size: 8" Connects auxiliary, tail lights and ground left, right and stop