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This adjustable base assembly is made of superior, high-strength steel for ultimate durability. Pair with outer tube for a secure, easy-to-use gooseneck coupler.

With superior steel construction, an adjustable-height design, fast and easy hookup and disconnect ability, and a tight fit around the ball for ultimate security, this gooseneck coupler is perfect for your heavy-duty towing needs.

Pull your gooseneck trailer with a fifth-wheel hitch by installing this square king pin adapter. Simply replace both the inner and outer tubes of the gooseneck with this unique coupler and you're ready to tow.

With superior steel construction, an adjustable-height design, fast and easy hookup and disconnect ability, and a tight fit around the ball for ultimate security, this gooseneck coupler is perfect for your heavy-duty towing needs.

With superior steel construction, an adjustable-height design, fast and easy hookup and disconnect ability, and a tight fit around the ball for ultimate security, this gooseneck coupler is perfect for your heavy-duty towing needs.

With superior steel construction, fast and easy hookup and disconnect ability, and a tight fit around the ball for ultimate security, this fixed-base gooseneck coupler is perfect for your heavy-duty towing needs.

Pull your gooseneck trailer with a fifth-wheel hitch by installing this round king pin adapter. Simply replace both the inner and outer tubes of the gooseneck with this unique coupler and you're ready to tow.

The heavy-duty, high-strength, fabricated steel construction and user-friendly, height-adjustable design of this square, gooseneck coupler make it the best for your towing application. Topwind crank included.

The heavy-duty, high-strength, fabricated steel construction and user-friendly, height-adjustable design of this square, gooseneck coupler make it the best for your towing application.

Weld this cast steel coupler head to 3" or 4" diameter tubing to create a heavy-duty gooseneck coupler with fast and easy latching action.