Bulldog BX1 Square Tube Gooseneck Coupler Bulldog
(Bulldog Part #: 128913)
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Delivered by 02/01/21 if ordered by 2:30pm CT today

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The BX1 gooseneck coupler is the result of generations of design expertise and field experience. It incorporates innovative features that revolutionize the benefits available from a gooseneck coupler.

This coupler has a 4" inner tube, 4-1/2" outer tube with a 25,000 lb rating. For use with a 2-5/16" ball.


    Ball Size2-5/16"
    Rating25,000 lbs
    Installation InstructionsCLICK HERE


    • Offers flexible mounting options with next generation locking plate coupler locking mechanism
    • Operates easily with one hand, thanks to new locking handle design
    • Provides continuous tight ball fit with ever-increasing cam tightening locking mechanism
    • Resists theft with integrated feature to allow pad-locking the coupler to the ball (lock not included)
    • Guides ball into socket more easily - letting you miss by more than a inch - with botom locking plate 50 percent larger than competitors
    • Lengthens life of locking mechanism with oil-impregnated bushings
    • Dual set bolts, 4 hole adjustment
    • 30.8" to 38.8" vertical adjustment - 8" total


    • Inner & outer tube

    Not Included:

    Installation Instructions CLICK HERE


    1919 - In a small third floor room over his car dealership in Wausau, Wisconsin, Thomas J. Jacob begins making high-quality precision tools of his own design. His venture becomes known as the Hammer Blow Tool Company. The death of a favorite hunting dog due to an accident involving a poorly-designed trailer hitch leads Jacob to develop the first drop-forged ball-and-socket trailer hitch, which he names the "Never Lets Go" Bull Dog. More inventions follow, positioning Hammer Blow at the forefront of the trailer industry at its infancy.

    1930's - Demonstration models of camper trailers built by Jacob at the Chicago World's Fair set off a period of rapid growth in the industry.

    1940's - Jacob dies in 1945. His wife, Lula, takes over Hammer Blow and guides it with great success for more than 20 years.

    1960's - In 1967, Lula Jacob sells Hammer Blow to Neway Equipment Company of Muskegon, Michigan, which later sells to Lear Siegler, Inc.

    1970's - In 1977, private investors led by Thomas J. Reinhart purchase and rename The HammerBlow Corporation. Expansion of the mechanical jack line and related products continues for more than a decade.

    The above information has been provided by the Manufacturer, and we cannot guarantee the accuracy thereof or endorse the opinions expressed.