Fabricated using extra heavy wall tubing for maximum strength. PopUp Extended Coupler gives you an additional sixteen inches clearance between the truck cab and the trailer nose, and between the truck tailgate and the trailer bulkhead. This gives you more trailer swing and more room for hook-up. To make your towing experience better yet, this extended coupler is fitted with a PopUp GN8 self-latching coupler. This coupler latches when the trailer is lowered onto the ball. It also has a molded hitching guide to make coupling easier. To uncouple, you simply pull a release cable located near the trailer jack handle. The GN8 coupler has a rating of 28, 000 pounds. Part measures 4 1/2? outside to outside. Make sure it will fit as many of the China made tubes are not all sized consistently and many are under sized. PopUp will assume no responsibility for returns when incorrect measurements are taken. Precision coupler casting extends life of ball. | Popup Towing Products LLC SB212 Gooseneck 12" Offset Coupler, 4.5" Square Tube