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  1. Gooseneck Coupler
  2. Bulldog
  3. Round Tube
  4. Coupler with Inner Tube Only
  5. 25000 lbs GTW
  6. Manual Latch
Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs

Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs

Our Price: $163.79
You Save: $84.92
Gooseneck Coupler
This item qualifies for Free Shipping
Shipping Weight: 31 lbs
Bulldog Gooseneck Coupler - BD1289020300
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Base assembly is made of durable steel. Large bottom locking plate makes hookup fast and easy. Ball pocket provides tight fit with less rattle. Pair with existing outer tube for a secure, easy-to-use gooseneck coupler. 1-636-306-4830 to order Bulldog gooseneck coupler part number BD1289020300 or order online at Free expert support on all Bulldog products. Great prices and Fastest Shipping for Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs. Gooseneck Coupler reviews from real customers.
  • All Info
  • Reviews (241)
  • Q & A (0)
  • Photos
  • Why etrailer?

Bulldog Gooseneck Coupler

  • Round Tube
  • Coupler with Inner Tube Only
  • 25000 lbs GTW
  • Manual Latch
  • Bulldog
  • 2-5/16 Inch Gooseneck Ball

Base assembly is made of durable steel. Large bottom locking plate makes hookup fast and easy. Ball pocket provides tight fit with less rattle. Pair with existing outer tube for a secure, easy-to-use gooseneck coupler.


  • Sturdy inner tube pairs with existing outer tube to create adjustable gooseneck coupler
  • Oversize funnel makes it easy to guide ball into socket
    • Bottom locking plate is 50 percent larger than competition
    • Coupler engages even if you miss the ball by just over an inch
  • Tight ball fit helps to reduce jarring and rattling
    • Ball pocket provides contact on both sides of ball
  • One-handed operation with easy-to-use handle
    • Lockable with padlock (sold separately)
    • Oil-impregnated bushings increase life of locking mechanism
  • Smooth operation over time
    • Integrated grease fittings throughout make for simple maintenance
  • Superior, high-strength steel construction


  • Ball size: 2-5/16"
  • Tube outer diameter: 4"
  • Range of vertical adjustment (when used with outer tube): 8"
  • Overall length: 28-1/2"
  • Weight capacity: 25,000 lbs
  • Limited 5-year warranty

1289020300 Bulldog BX1 Gooseneck Trailer Coupler without Outer Tube - 25,000 lbs

Item # BD1289020300

Installation Details BD1289020300 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs - BD1289020300

Average Customer Rating:  4.8 out of 5 stars   (241 Customer Reviews)

Base assembly is made of durable steel. Large bottom locking plate makes hookup fast and easy. Ball pocket provides tight fit with less rattle. Pair with existing outer tube for a secure, easy-to-use gooseneck coupler.


Great, well built product and support. I had several questions about this product and someone from their technical support team promptly responded multiple times until all of my questions had been answered.

By far the best bang for the $$$. It would have been nice if it had come pre-painted or at least primed but the decals had peel off covers so you could simply paint it the color of your choice and then peel off the covers and it looks great.

Very well built and sturdy product. Can't ask for more.


Very fast shipping. The inner coupling is exactly what I was looking for. The new design latch is a big plus. Will differently does business with again

The inner coupling is working great and has made it easier to hook up since ball doesnt have to be centered below hitch
Richard L - 09/25/2021


Excellent packaging, was no rust on item very clean , fit perfectly


I replaced my old bulldog coupler with the newer BX1 coupler, it's so much nicer and easier to lock/unlock. I've not actually used it yet, I did locked the ball in the coupler on my original and the BX1 to compare and it was a much tighter fit. I can tell I'm going to love it - can't wait to pull my bobcat, I'm sure it's going to be a smooth ride.

Just hauled my bobcat 325 miles and my BX1 coupler did and awesome job! No worries pulling with this’s so much safer than my old one.
KT - 12/14/2017


Purchased this replacement for the original coupler. I had to cut the tube to the correct length on my older enclosed Featherlite gooseneck. The coupling operation is easier and I love the beveled/centering coupler which makes it much easier to center the ball while lowering the trailer.
Excellent newer designed product from Bull Dog!


The customer service at etrailer is amazing! I had ordered a gooseneck coupler not realizing that was on back order until april. I called and explained what had happened and they quickly found a similar product that was in stock and ready to ship. I actually received it the next day. Everything fit and works just like it should. I will definitely be using and recommending etrailer in the future!


Lets go with bullet points!!!

•ARRIVED in 3 days!
•Lowest price I could find!
•Enhanced my trailer!
•Quality product!

Thanks etrailer, you came through for me again!


Great Product and very pleased with it. Only thing that had to be done was cut 3 inches off the tube so that the Hart trailer would sit level on the the Freightliner. Also very pleased with how quickly everything got shipped and was delivered. Thanks Again!! I will recommend this product to anyone and how easy it is to hook up and the design of the coupling and latch.


Very efficient. Quick service. Wi definitely be doing more business with etrailer.

Larry T - 05/16/2020


I am very pleased with my purchase Bulldog Gooseneck Coupler. Also pleased with the shipping.


This part replaced an old couple. This is well built, but the service from etrailer on the order was excellent.


Sales person was very knowledgeable and helpful
Part worked and trailer is back to doing its thing,
Hauling equipment the safe way
Thank you


Great website and products plus free fast shipping, I continue to come back for all my trailer needs.


I was very pleased with the quality and workmanship of this product. The customer service is great!


The products are great as the service is too, fabulous company to do business with.


It came with a broken peace new one on it's way thank you.



Great Product no issues at all


Made the ordering easy, great customer service!



Fast Shipping , thank you for great service


Exactly what I needed!


Review from a similar BX1 in Gooseneck Coupler

The coupler was on back order for a little over a year, I understand that it was out of etrailer’s hands due to supply issues. The other slight problem was that I would have thought that the industry should have a standard, my trailer hitch is 4” square tube ghe coupler came and would not fit I had to mill ir to fit. etrailer people were nice and cooperative in checking on the order and offering other options but I told them I would wait on the one I ordered.

I have sent your information over to our customer service department for them to assist you with the coupler.
-- Etrailer Expert Katrina B - 08/17/2022


Review from a similar BX1 in Gooseneck Coupler

The insert came, shipping was fast and packaging excellent, but here's the rub, it will not fit into the sleeve. It looks just like the one that slip out and the hitch part looks super, but it is probably a sixteenth in circumference too large. Will not fit into the sleeve without lot of grinding. Grrrrr!

This gooseneck coupler innertube has an outer diameter of 4 inches.
-- Etrailer Expert Katrina B - 03/28/2022


Review from a similar BX1 in Gooseneck Coupler

Honestly i feel short changed the welds should really be 100% across regardless of whether necessary or not. Some oil so it didnt rust during shipping would of also been appreciated but again not end of the world. The welds appear to be robotic if they're by hand they did an awesome job.of what was done but again, for the time to finish the seams wouldnt of been a real big deal on the production side, but i sure do appreciate the capacity its rated and i plan on using it to its fullest. Thanks again

Show More Reviews

See what our Experts say about this Bulldog Gooseneck Coupler

  • Overall Length of the Bulldog BX1 Gooseneck Coupler part # BD1289020300
    I went out into our warehouse to measure a Bulldog BX1 Gooseneck Coupler part # BD1289020300 that we have in stock and found that it measures 28-1/2 inches in length.
    view full answer...
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  • Could Bulldog BX1 Gooseneck Coupler Fit 1989 4 Star Gooseneck Horse Trailer
    The Bulldog BX1 Gooseneck Coupler Inner Tube # BD1289020300 that you referenced has an outer diameter of 4 inches and is designed to fit the standard size of 4 inch outer gooseneck tubes. If that's what you trailer has this will fit and work well. The pin hole that secures the tube is 3/4 inch in diameter which your outer tube will need to have as well.
    view full answer...
  • Height Adjustment Hole Spacing on Bulldog BD1289020300 Gooseneck Coupler
    The linked photo of the Bulldog BX1 Gooseneck Coupler Inner Tube # BD1289020300 shows the four vertical holes that allow for 8-inches of height adjustment. My contact at Bulldog advised that the top hole's center is 18-iches up from the top of the coupler. The hole centers are spaced apart 2.6-inches.
    view full answer...
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  • Recommended Bulldog Gooseneck Coupler Inner Tube
    If you are just needing the inner tube for your Bulldog Gooseneck Coupler, I recommend looking at the Bulldog BX1 Inner Tube # BD1289020300. This base assembly is made of durable steel and features large bottom locking plates for fast and easy hookup. It has the same 25,000 pound weight capacity as the full assembly you were looking at and is designed for a 2-5/16 inch ball size. The tube's outer diameter is 4 inches and its overall length is 28-1/2 inches. The range of vertical adjustment...
    view full answer...
  • Wall Thickness of Bulldog BX1 25K Gooseneck Coupler Inner Tube
    I spoke to Bulldog about the Bulldog BX1 Gooseneck Coupler Inner Tube part # BD1289020300 and they informed me that the wall thickness is .255". Please note, wall thickness does not denote weight capacity in and of itself.
    view full answer...
  • Bulldog BX1 Gooseneck Coupler Inner Tube Dimensions
    The Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs item # BD1289020300 measures 25.8" from the center of the bottom hole to the very top of the coupler. I have attached a diagram I made showing this dimension. You are correct the holes are 2.6 Inches apart center to center.
    view full answer...
    Image 1 for
  • Availability Of Gooseneck Coupler To Replace 4 x 30 Coupler
    I have an option that may work for you. The closest inner tube gooseneck coupler to the 4" x 30" dimensions you mentioned is the Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs # BD1289020300 which has a 4" diameter and is 28-1/2" tall. This coupler has a 25000lb weight rating, and when used with the outer tube has 8" of vertical adjustment. If you need a coupler with a higher weight rating I recommend Convert-A-Ball Multi-Cushioned Gooseneck Trailer Coupler...
    view full answer...
  • Replacement Inner Tube For Gooseneck Trailer Coupler That Doesn't Use Through Pin
    You will be able to use a inner tube like the Convert-A-Ball Multi-Cushioned Gooseneck Trailer Coupler # CG that also does not have the holes for the pin. This particular tube has the cushioned coupler to help reduce road shock from the trailer into your F-750. If the inner tube has the adjustment pin like the Bulldog BX1 Gooseneck Coupler # BD1289020300 it cannot be used with your outer tube.
    view full answer...
  • Replacement Inner Coupler for Ranch Hitch Fifth Wheel to Gooseneck Adapter
    We have a replacement inner coupler or the Ranch Hitch with part # AM3101 but the # BD1289020300 would not fit in place of this.
    view full answer...
  • Can the B&W Defender Locking Gooseneck Coupler Be locked in the Open Position?
    To leave your coupler unlatched you will need a manual locking coupler like the Bulldog BX1 Gooseneck Coupler # BD1289020300. The B&W Defender Locking Gooseneck Coupler # BWGNC4250 will only lock in the closed position. Using the manual locking coupler will make it easier for you to use with your skid steer to move around your farm.
    view full answer...
  • Will Bulldog BX1 Gooseneck Coupler Inner Tube Fit 1989 4-Star Gooseneck Horse Trailer
    Yes, you can use the Bulldog BX1 Gooseneck Coupler Inner Tube # BD1289020300 for your application but you will need to drill out a hole going through your outer tube for the pin. I confirmed this with my contact at Bulldog and I have attached a clip from the installation instructions for you to check out. If you would rather not go this route then the only other option we have for an inner tube with a 4" diameter that doesn't require the use for a pin going all the way through is the Convert-A-Ball...
    view full answer...
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  • Recommended Lockable Gooseneck Coupler Inner Tube And Padlock
    Yes, the Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs # BD1289020300 is lockable with a standard padlock. I recommend the Master Lock Laminated Steel Padlock- 1-9/16" Wide- 3/8" Shackle - Blue Cover - Keyed Alike # ML312KA for a little less metal on metal rattle.
    view full answer...
  • Can Just Inner Tube Of Gooseneck Coupler On 2004 Featherlite 8541 Be Replaced?
    As long as the your current inner tube of your gooseneck coupler on your 2004 Featherlite 8541 measures 4" in diameter then you can absolutely use just the inner tube of the Round Gooseneck Coupler with 28" - 38" Adjustable Height - 24,000 lbs # SAC2516-I you were looking at. Another option is just purchasing the Bulldog BX1 Gooseneck Coupler Inner Tube - Round - 2-5/16" Ball - 25,000 lbs # BD1289020300 which is just a the inner tube and will save you a little bit of money over buying...
    view full answer...
  • Gooseneck Coupler That is Needed Longer Than 22 inches
    We do have some options available that are a bit longer than the Bulldog BX1 Gooseneck Coupler Inner Tube # BD1289050300. The Bulldog BX1 Gooseneck Coupler Inner Tube # BD1289020300 has the same diameter and hitch ball spec and it has an overall length of 28.5" which is 6.5" more than the part you were looking at. The only problem is that it is only rated for 25,000 lbs. If you are needing the 30,000-lb weight capacity rating then you can go with the Convert-A-Ball Multi-Cushioned Gooseneck...
    view full answer...
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  • Safety Chain Recommendation for Use with Bulldog Coupler 1289020300
    For a general-purpose safety chain for a standard gooseneck coupler like the Bulldog part # BD1289020300 we offer # FCHA0050324 from Fulton. This is a 42-inch Grade 70 chain with 5/16-inch clevis. This is sold as a single chain, not a pair. Most people will weld the chain to the trailer or some will bolt it on. The part # AM3109 is designed for use on a Ranch Hitch adapter and was not intended for use on standard couplers.
    view full answer...

Do you have a question about this Gooseneck Coupler?

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
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Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
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Alexander C
Employee Isabelle B
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Employee Randy B
Installed by:
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