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You won't find a coupler that's faster or easier to use than the Bulldog Square Tube Gooseneck Coupler. Its user-friendly design makes hookup and release swift and secure. Coupler includes 4-1/2 inch square outer tube, 4 inch square inner tube with cast locking plates, 3/4 inch load bearing pin and 2 set screws. Tight ball fit reduces jarring when changing speeds or on rough roads. Self-centering locking plate lets you miss the ball my more than an inch. Easy-grip handle is accessible from any position.