4-1/2 inch Outside Diameter, of the square tube that goes in the gooseneck. Before you order, measure your neck tube. Nine Inch Extended Coupler for Square Trailer Coupler Tubes

• Nine Inch offset between truck and trailer.
• More trailer swing.
• Easier hook-up.
• Fits 4-1/2″ square SB2 below O.D. trailer coupler tubes.
• Coupler latches and unlatches remotely.
• Precision coupler casting extends life of ball.
• 24,000 lbs. Gross Trailer Weight.
• 6,000 lbs. Gross Tongue Weight.
• Extra heavy wall tube for maximum strength.
• Includes coupler release cable and hardware.
• 100% complete.

Fixed shipping