Arrives before Christmas 
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Replace the vinyl cap that slides over the car-side air valve on your Air Force One supplemental braking system. Prevents damage to the valve.
Features:
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
So it's never a bad idea to pick up a replacement small plug, and a large plug for your tow vehicle and your towed vehicle. This is what's going to ensure the longevity and smooth running of your SMI system. This is going to go over the end of your female and male end, so that you don't have to worry about getting any dirt or debris inside your air hose fitting when you're not using it. We'll put one on our vehicle end too, just to keep the dirt and debris out of that also.My personal opinion, if I had a system just like this, I would want to make sure all of my plugs are all plugged up before I go anywhere after my trip. So that means when I unhook my air hose that stretch from my towed vehicle to my tow vehicle, I'm going to pick up a couple of these extra plugs and put them over top of the fittings on my hose too, just to make sure everything in that hose stays nice and clean.Well guys, with all that being said, that's going to do it for our review and replacement of our large and small rubber caps.
Average Customer Rating: 4.9 out of 5 stars (264 Customer Reviews)
Replace the vinyl cap that slides over the car-side air valve on your Air Force One supplemental braking system. Prevents damage to the valve.i=I ordered two of these however they will only fit on the male end of the quick connector its way too small to fit over the female quick connector if you have the larger one for the motorhome that came with the kit please let me know ,thanks
I opened the package when it arrived. Inside I found 2 perfect looking replacement caps. The replacement caps fit as expected
This hitch is amazing!!! Be prepared though it is very heavy! I love how easy it is to adjust to different heights and ball sizes with the 2 common sizes provided. The scale on the back can be helpful to let you know if you have the proper trailer weight. The more you use it the more you will like it!
I’ve felt with etrailer a number of times over the years and have always been satisfied with the service and product.
Exactly what I needed, Quick response and shipping
Exact replacement for original lost cap. Thanks
Perfect fit for AF1 setup
Good price.
Works like the original. Needed to keep junk out of air connection.
does the job
I bought some spare large and small air fitting covers used on our SMI Air Force One supplemental braking system. These small plastic covers can split after some use--as have the ones in use on my system. Not much more to say. They keep the dirt out of the lines. I always like to have a few spares.
Etrailer always gives good service. I usually look to them first for RV related parts.
Roger
9/14/2020
Air line fitting covers are still going strong!
I’ve still got the original caps. They are in very good condition after 8 years. It’s a good to have extras.
These fit fine but are way overpriced!
I'd like to see a modified version of both of them to accept a ring or cord to attach to the vehicles so you don't lose them.
It’s a fine fine dust/bug protector.
Hard to find caps over the ports on the vehicle, related to the Air Force One supplemental braking system. Caps fit properly and are still in use 1 year later. These ports can be stolen by insects, specifically wasps, looking for a hiding place when RV is in storage, so the caps are necessary to keep out pests and dirt that may foul the air line. Keeping them covered is the best choice on both the motorhome and the tow vehicle.
Great service.
Mine delivered were not shaped like the picture. The diameter is the same and does not slim down to shape of democrats fitting.
Jenny N.
3/30/2023
I am glad that you caught that! The design has changed so that it is straight instead of tapered at the end. We will be updating the picture as soon as we can.
Well - there’s not much to say about this. It fits as it is suppose to, and it keeps dirt and moisture out of the air fittings for my supplemental braking system when the truck is not connected to the motor home.
The part is exactly what I needed, but is very expensive.
Exactly what I ordered.
Fast delivery, reasonable price, k
MAKE THE REPLACEMENT TIGHTER
This wasn’t what I thought I was getting, see attached photo of sleeve that goes over connection when hooked up
Etrailer is the place we to go to for just about any part. Good prices and quick service. Thx!
Michael
8/16/2021
Perfect and fast shipping
Ted
7/27/2022
Easy to hook up
Everything was as ordered. It arrived when I was told it would be. Several orders from etrailer and never a problem.
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Jenny N.
5/29/2024
There is another cap that Demco offers. It is part # SM99609 which replaces the large vinyl cap that slides over the Quick-Disconnect air valve on the Air Force One supplemental braking system.