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  1. Adjustable Trailer Coupler
  2. Demco
  3. 2-5/16 Inch Ball Coupler
  4. Coupler Only
  5. 21000 lbs GTW
  6. Auto Latch
Demco Trailer Coupler - Cast - Adjustable Channel - eZ-Latch - Black - 2-5/16" Ball - 21K

Demco Trailer Coupler - Cast - Adjustable Channel - eZ-Latch - Black - 2-5/16" Ball - 21K

Item # DM15791-81
Our Price: $115.90
Adjustable Trailer Coupler
This item qualifies for Free Shipping
Shipping Weight: 9 lbs
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Cast ball coupler is made of sturdy steel and has a durable black powder coat finish. Metal eZ-Latch ensures fast, easy, secure hookup and disconnect. Adjustable channel bracket and mounting hardware sold separately. 1-636-306-4830 to order Demco adjustable trailer coupler part number DM15791-81 or order online at Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Trailer Coupler - Cast - Adjustable Channel - eZ-Latch - Black - 2-5/16" Ball - 21K. Adjustable Trailer Coupler reviews from real customers.
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  • Reviews (347)
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Demco Adjustable Trailer Coupler - DM15791-81

  • 2-5/16 Inch Ball Coupler
  • Coupler Only
  • 21000 lbs GTW
  • Auto Latch
  • Demco

Cast ball coupler is made of sturdy steel and has a durable black powder coat finish. Metal eZ-Latch ensures fast, easy, secure hookup and disconnect. Adjustable channel bracket and mounting hardware sold separately.


  • Cast ball coupler lets you hook up your trailer to your tow vehicle
    • Provides connection point for hitch ball
  • eZ-Latch mechanism ensures simple, secure hookup and disconnect
    • Lets you hook up when latch is in closed position - just drop coupler over hitch ball and latch will snap into place
  • Adjustable channel mount lets you change coupler's height depending on application
    • Channel bracket and mounting hardware sold separately
  • Sturdy steel construction
  • Black powder coat finish offers excellent corrosion resistance
    • 500-Hour salt spray rating - great for marine applications
  • SAE J684 certified
  • Made in the USA


  • Application: 3" wide channel bracket
  • Ball size: 2-5/16"
  • Weight capacity: 21,000 lbs
  • Coupler dimensions: 8-1/8" long x 2-7/8" wide
  • Diameter of lock pin hole: 5/16"
    • Minimum span needed for pin lock through body: 3"
    • Minimum span needed for pin lock through latch: 1-1/8"
  • 1-Year warranty

Note: (4) 5/8" Grade 5 mounting bolts must be used to achieve the 21,000-lb weight capacity

eZ-Latch Coupler

This coupler features a simple-to-use latching mechanism known as the eZ-Latch. With this mechanism, hooking up is as easy as dropping the coupler over your trailer hitch ball. The latch does not need to be tugged or manually activated to allow the ball into the coupler socket, nor does it have to be secured in place. Just make sure that the coupler is properly lined up with the ball when you lower it, and the rest is automatic. Disengaging the coupler is just as effortless. Simply lift up the handle and the coupler socket will automatically release its grip on the ball.

Demco eZ-Latch in Use

Unlike most couplers, which only have a pin hole on the handle latch, the eZ-Latch coupler features a hole on the latch and on the side of the coupler itself. Inserting a coupler lock through this hole will keep the latch from lifting, preventing disconnect and theft.

Sturdy, Corrosion-Resistant Construction

Made of sturdy steel, this coupler features a durable black powder coat finish that is designed to limit rust and corrosion. This finish has a 500-hour salt spray rating, making the coupler perfect for marine use.

15791-81 Demco Trailer Coupler with Easy Latch for Adjustable Channel Bracket - Black - 2-5/16" Ball - 21,000 lbs

California residents: click here

Video of Demco Trailer Coupler - Cast - Adjustable Channel - eZ-Latch - Black - 2-5/16" Ball - 21K

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Demco Adjustable Trailer Coupler - Coupler Only - DM15791-81 Review

Today we're going to be taking a look at a Demco trailer coupler. This is a cast-ball coupler that lets you hook up your trailer to your tow vehicle. It's going to provide a connection point for a hitch ball. This one's designed for a two and five sixteenths in ch ball. This unit's going to feature the easy latch mechanism. It's going to ensure simple, secure hook-up and disconnect. What that means is, all you have to do is simply drop the coupler over the ball, even with the latch in the closed position.

Everything's going to engage automatically. The latch is going to snap into place, it's going to engage around the hitch ball. That way why don't have to have it open. You can if you want to, that's totally your preference. The neat thing about this one, one of the main benefits, is with the latch in the closed position, you can drop it over the hitch ball and it engages automatically. When it comes to mounting, it's going to use an adjustable channel mount design.

That's going to allow you to change the coupler's height depending on the application. Channel bracket mounting hardware is sold separately. We want to recommend using hardware kit, part number DM6166. That'll give you everything that you need to get this installed onto an adjustable bracket or a channel mount bracket. That is sold separately and can be found here at The unit's made from a sturdy steel construction.

It's going to feature a black powdered coated finish. It's going to do a great job at resisting rusting, corrosion and lasting a long time. It actually features a 500 hour salt spray rating, which is going to make it great for marine applications. It is SAEJ684 certified. This is designed for a three inch wide channel bracket. It's going to accept a two and five sixteenth hitch ball.

The weight capacity for this unit is 21 000 pounds. now, taking a look at a few dimensions real quick. Starting with the overall length, that's going to give us a measurement of eight and one eighth of an inch long. Again, designed for a three inch wide channel bracket, so the width back here is just under three inches, it's about two and seven eighths. That way it fits perfectly inside that bracket. You'll notice that on the unit, it's going to feature two lock-pin holes. That way you can use a coupler lock or a coupler pin and lock. Or a pin and clip. Your going to have a coupler area right here for a pin. The diameter of the lock-pin holes on the unit are going to measure five sixteenths of an inch. If you're going to use this one right here, which would just lock the latch, that's going to need a usable pin length, or a span of one and one eighth of an inch. There's also one down here, which would keep the wedge from actually operating. Which is going to be great for you're unattended trailer, making sure nobody runs off with your trailer. The usable pin length, or span needed for using this location would be three inches. Coupler pins and clips and pins and locks are sold separately. You can find everything that you need, right here at That's going to do it for today's look at the demco trailer coupler.

Customer Satisfaction Score:

Customer Reviews

Demco Trailer Coupler - Cast - Adjustable Channel - eZ-Latch - Black - 2-5/16" Ball - 21K - DM15791-81

Average Customer Rating:  4.8 out of 5 stars   (347 Customer Reviews)

Cast ball coupler is made of sturdy steel and has a durable black powder coat finish. Metal eZ-Latch ensures fast, easy, secure hookup and disconnect. Adjustable channel bracket and mounting hardware sold separately.


Nice unit. 15 minute installation.


Was very easy to install. I did have to grind a bit off the back so I could get clearance for the bolt holes to line up. Only took about 30 min to install.


Super helpful and great product,price was good, shipped to the house quickly for free. What could be better?


Order shipped earlier than expected and arrived on time. Edith was extremely helpful and product is what I expected it to be. Would definitely order from etrailer again


Works great on my 7x14 14k dump trailer. The finish is holding up great. I have no complaints.


The sales rep. I talked to was very helpful with our order




I ordered an easy latch trailer coupler in silver, about two days later I got a call and was told that silver was out of stock, but I could get sent black. I agreeed to black instead of silver. However when I received my trailer coupler it was a whole different model. I did not have time to send it back, however not the greatest to receive something different than what I ordered.


The coupler would come loose unless it was pinned before I loaded my tractor on the trailer. This coupler stays open when hooking up and closed when in use.


Quick shipping, good communication, Quality products, The only place for Trailer Parts.


All items on the order were correct and delivered as stated by the company.
We would highly recommend etrailer and plan on ordering from them in the future


Exactly what I needed to get my heavy trailer back in shape!


Delivery was very quick & the item fit perfectly.

you etrailer.


Very good product - works well for our application


Quality part for the money.Fast delivery


Great product, beautiful finish and paint, fast shipment. Well pleased


Thanks for the quick response helping me out.




Review from a similar eZ Latch Coupler in Adjustable Trailer Coupler

Very good quality, construction, and finish. This was used to replace a 5000# rated coupler on my RV trailer that was just not strong enough. It has an extra 2-3" of length than the old coupler so make sure your safety chains have enough length to accommodate the extra length. One bonus for me was that the extra length was just enough to allow me to open the back door of my SUV with the trailer hitched (which I couldn't do before). The DEMCO coupler does take a 2 1/2" wide hitch pin /lock which is different than most couplers.


Review from a similar eZ Latch Coupler in Adjustable Trailer Coupler

My order shipped quickly and showed up in good time. The coupler looks good, but i was disappointed in the gross tongue weight of 10% of total Gross trailer weight. This was not advertised in the details online. I was expecting a 20% tongue weight. If there is another coupler with a 4k/21k rating id appreciate a link.

I checked and we do not have an adjustable coupler that has a higher TW capacity.
-- Etrailer Expert Jenny N - 11/02/2022


Review from a similar eZ Latch Coupler in Adjustable Trailer Coupler

The coupler came quickly and fit perfectly. So much better than the original.
I will make sure all my trailer business will go to etrailer.

It continues to perform like it was new. I will never have a trailer without one!
JOE E - 01/24/2022


Review from a similar eZ Latch Coupler in Adjustable Trailer Coupler

Hitch works great, almost no chance of user error, very positive coupling with min. play on the ball. Zinc plate is thick and uniform. No chance to damage the paw it's very robust.
I did have to drill the lock pin holes with 8mm bit because a 5/16" hasp on the lock was to tight.


Review from a similar eZ Latch Coupler in Adjustable Trailer Coupler

Installed this AWESOME hitch on my 20 ft equipment trailer after I upgraded to 8k axles. This hitch is a beast. I love the no touch when hooking up. Just lower the trailer down and it makes a positive lock sound. I welded the hitch to a 1/2 inch thick plate. Welded the plate onto the trailer and used my own gussets instead of the supplied ones. You won’t go wrong with this hitch!


Review from a similar eZ Latch Coupler in Adjustable Trailer Coupler

Replacing a sloppy 21K pintle with this hitch, pintle came with a trailer I bought used so this will be a quiet replacement to pair with my B&W Tri-ball I bought a couple years ago with etrailer.

Show More Reviews

See what our Experts say about this Demco Adjustable Trailer Coupler

  • Material of Latch Handle on Demco Trailer Coupler
    The review on the product page for the Demco Trailer Coupler # DM15791-81 is actually from a similar product and not the exact same coupler. I'm not sure the product the customer is referring to but the latch handle of # DM15791-81 is metal.
    view full answer...
  • Is The Composite Or Steel Demco EZ Latch Coupler A Better Choice Over The Other?
    Personally I prefer the Demco Trailer Coupler # DM14976-52 with the composite handle over the Coupler # DM15791-81 with a metal handle. I feel it is easier to operate as it does not have the safety latch like you get on the metal handle. Since most trailers are always outside the safety latch tends to get some corrosion in the handle and can become difficult to open. Both these couplers will need the Hardware Kit # DM6166 to mount to a 3" channel. You will need a locking pin like the...
    view full answer...
  • How to Mount an Adjustable Trailer Coupler
    Adjustable trailer couplers are not going to mount to your truck; they will attach to the frame of your trailer. Some of the adjustable couplers, such as the Bulldog Cast Head # BDA2563C0317 come with the mounting hardware to weld onto the frame of your trailer. Others, such as the Demco # DM15791-81, come with the channel bracket # DM66134 and mounting hardware # DM6166 separately. I've added a link to our page with each of our 2-5/16" adjustable trailer couplers for you to take a look at.
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Amanda M
Written by:
Amanda M

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