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Replacement Air Jumper for Demco SBS Air Force One Supplemental Braking System

Replacement Air Jumper for Demco SBS Air Force One Supplemental Braking System

Item # SM99666
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SM99666 - Jumper Demco Accessories and Parts
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Replaces the air jumper for Demco SBS Air Force One supplemental braking system (SM99202). 1-636-306-4830 to order Demco accessories and parts part number SM99666 or order online at Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Replacement Air Jumper for Demco SBS Air Force One Supplemental Braking System. Accessories and Parts reviews from real customers.
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  • Reviews (199)
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  • Videos (3)
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Demco Accessories and Parts - SM99666

  • Tow Bar Braking Systems
  • Air Line Parts
  • Jumper
  • Demco

Replaces the air jumper for Demco SBS Air Force One supplemental braking system (SM99202).


  • Replaces the air jumper for Demco SBS Air Force One supplemental braking system (SM99202)
    • Coiled air hose connects air assembly in RV to operating unit in towed car
  • Length when fully stretched: 7'

6212 Demco SBS - (Formerly SMI) Replacement Coiled Air Hose for Air Force One Supplemental Proportional Braking System

Replaces Demco SBS SM88249 and SM99666

Video of Replacement Air Jumper for Demco SBS Air Force One Supplemental Braking System

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

Video Transcript for Demco SBS Air Force One Supplemental Braking System Replacement Air Jumper Installation

Hello, everybody, Clayton here at Today, we're going to be working on our 2020 Ford Expedition. We're going to be taking a look at the replacement air jumper line by Demco. This replacement line is going to work well for you, if your motor home has a larger fitting, than your Air Force One fitting on your vehicle. So in our case we do have a quarter inch fitting on our towed vehicle. We have a half-inch fitting for our motor home.

Now, getting this installed is going to be super easy. You simply just push on to the fittings. I always like to pull on them a little bit after to make sure they're not going to go anywhere. Then we do have our airline here. It is coiled, and it's seven foot long.

With it being coiled, you don't have to worry about that dragging the ground and ruining your cord. But also it's going to stretch long enough to make that gap, whenever our tow bar is in lock position. We just want to take this. We just want to push our fitting into our motor home side and then move our collar up, locking it in place. That's pretty much going to do it for our look at the replacement air jumper line.

For your Demco Air Force One on our 2020 Ford Expedition..

Customer Reviews

Replacement Air Jumper for Demco SBS Air Force One Supplemental Braking System - SM99666

Average Customer Rating:  4.8 out of 5 stars   (199 Customer Reviews)

Replaces the air jumper for Demco SBS Air Force One supplemental braking system (SM99202).


I bought this as a spare, but now I use it all the time now because the original had to be threaded thru the safety cables but this coiled air jumper sits on top of the towbars - easier and quicker on the connect/disconnect.


OEM replacement for the hose that my RV dealer installed that connects between my Jeep and my motorhome. Initially I ordered the other one that said Freightliner but one of the ends was too big even though my Tiffin has a Freightliner chassis. This one has 1/4" connections and is perfect.


The product is exactly what I expected. I'm simply replacing the original air jumper hose that came with my Air Force once Supplemental Braking System - which was damaged during use. I won't lie - I was frustrated to learn that the manufacturer decided to use "off size" connectors - which is what turns this into an $85 hose - rather than a $25 hose I could have purchased virtually any [online store] IF they had used simple 1/4" connectors.

I am, however, quite satisfied with's service. I ordered the replacement hose while traveling - trying to time the delivery of the replacement hose to an out of the way campground in out in the middle of a Florida swamp. etrailer shipped my order the very day that I ordered it. It arrived 3 business days later as promised. Big UPS to for their speedy service.


As ALWAYS the etrailer crew got me exactly the parts we needed in record time! Can’t say enough good things about this business!!!!! They have saved me a fortune, always shipped quickly, and provided tech support every time I had a question. If you are FT RVers, or even just take long trips, these are the folks to trust with your towing and trailer needs. V/R


The fittings on this air link are proprietary to Demco, and it cost just about as much to buy the fittings separately. So I decided to buy the whole a spare. I found the same thing on several websites. Most were cheaper than Etrailer. A couple where I tried to order first were $30.00 cheaper! However, on all of those sites it was backordered. Demco is the ONLY one that has it in stock, but won't match the price since the cheaper ones are backordered. If they would have honored their "low price guarantee" as advertised, this would have been a 5 star transaction. Ordered it anyway, as I needed a spare before leaving on a trip. So spent the extra money and happy to have it.


This air hose is a replacement for my RV supplemental brake system. ( have not yet used it, but it appears to be well made.


Simple attachment


I had trouble finding this item on your web site. If you put in air hose from rv to toad it doesn’t come up


Exactly what I needed. E Trailer always comes through with great products.


The incorrect item was originally sent because of a mistake in the web catalog. Called to get this corrected and was helped by Alex J. He did a fantastic job in figuring out why I received the incorrect item, worked on getting me the correct item and set me up for a refund on original incorrect item. Refund hasn't yet been received, but I expect it soon. Great customer service.


GREAT! just great service and products and prices, shipping... all great!


The part was exactly what I needed, that was the easy part. They had it in stock and, even thought I called late in the afternoon they got it shipped the same day. It arrived at my campground and I was off on the next leg of my travels.


Works great, but then its just an air h ose.


Works as advertised. Easy order, prompt delivery.


Works exactly as advertised.


I continue to be impressed with the regular communication and updates from every stage of the order/shipping process.


The ordering process was easy and the shipping was fast. The jumper was just as described. Connected as it should to the coach and our jeep that we tow. It is always a pleasure dealing with etrailer.

by: had exactly the part I needed and it was shipped and delivered promptly.

We just returned from a 6,000 mile trip and the air line has performed flawlessly. Once connected it stays secure through many twists, turns, and bouncy gravel roads.
Thomas - 08/01/2021


Quality part, straightforward assembly/ replacement


Exactly what i needed as a replacement. Works as expected.


The installation instructions were clear and the product worked the first time I tested it. I recommend this system.


Needed backup jumper. Works as advertised, good product. Would purchase again if needed.


Exactly what the description described and what we needed! Excellent service! Would use site again.


Best store for RVers, do not stop on your way, just put it in the cart!


I just returned from a 3100 mile trip where my current air brake hose started leaking as the result of an earlier accident. i must have checked 15 retail shops and RV centers along the way for a replacement product, no one had a separate hose, only the full air force one system. i found your company online and was happy that the product arrived ahead of schedule and works perfectly.

All great!
Chuck - 09/28/2020

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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Written by:
Laura H
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee David F
Installed by:
David F
Employee Chris R
Video by:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Clayton O
Test Fit:
Clayton O

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