Heavy Duty Gooseneck Trailer Coupler 30000LBS Round Tube HitchAll Our Items Are High Quality. Round Tubing Gooseneck 2-5/16″ Trailer Hitch Ball Coupler 25K lbs 8″ Adjustment. ROUND TUBING GOOSENECK 2-5/16″ TRAILER HITCH BALL COUPLER 25K LBS 8″ ADJUSTMENT. Round Gooseneck Trailer Hitch Ball Coupler 25K lbs. Replacement Aftermarket Parts/Not Original Manufactured Parts. Includes 3/4″.