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Old 09-30-2023, 03:40 PM   #1
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Brand: Thor Motor Coach
Model: Challenger 37LX
State: Florida
Posts: 315
THOR #6310
Replacement Valve Extenders

We have a 2017 Challenger 37LX. The factory installed valve extenders have started to leak. Does anyone have a link to replacements that would fit on our RV? Have search on line, including Amazon, but cannot seem to find an exact replacement. The origianls measure 5-11/16" (145mm) end to end. Thanks!

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Old 09-30-2023, 03:57 PM   #2
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You could try Thor Customer Service with your vin number.

Good luck.
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Old 09-30-2023, 04:43 PM   #3
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Model: 2018 24.1 AXISSIXxSIX
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Do not call Thor over such a thing.
They're busy with folk who NEED their customer service.
A poster here once called them for wood screws....

Thousands of choices on Amazon and ebay, etrailer, camping world and dozens of others.



I'm going to suggest going to a pro that knows if a 1/16th of an inch or 3 inches will make any difference, then have the pro do the install.

A picture you post here of the offending part, both on and off the vehicle, will help a lot to either replace or cure.
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Old 09-30-2023, 04:56 PM   #4
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I assume you are talking about straight metal valve extenders. The closest I could find after searching four pages on Amazon were these at 140 mm or 5.5”. For all I know they may be exactly 5-11/16” overall. Give them a try.

See: https://www.amazon.com/Bluecell-Stra...0&sr=8-51&th=1

David
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Old 09-30-2023, 05:10 PM   #5
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If you choose. Thor has a parts department. That can help you.

Safe travels.
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Old 09-30-2023, 05:20 PM   #6
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Model: Forest River Forester 235
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Are you looking for flexible extenders? As youíve noticed, they leak. You can get actual dually valves which are metal stems that are accessible from the outside wheel. It is the best solution but it costs about $150 for a set and the tires have to be removed from the wheels which can cost another $150 or so for four wheels. If youíve not replaced your tires yet itís certainly time and it would be a no cost time to install.
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Old 10-01-2023, 03:20 PM   #7
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These are readily available on the web, I went thru this issue last yr. I replaced a few times, to actually find a pin hole in the tire tread. But they are available in all lengths. Great time to install TPMS sensors. These will detect that one or two PSI drop in your tires over a month.
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Old 10-07-2023, 06:49 PM   #8
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I had an extension break off last year, in the morning it was there, at the end of the drive it was gone. Who knows how....
Luckily, the tyre stayed up.
Anyhow, I did struggle to get exactly the same and settled on a flexible extension from Amazon, I got 2 so now keep a spare one added to the spares locker.
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Old 10-07-2023, 07:20 PM   #9
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Chevrolet Chassis

Itís interesting that I fussed with this issue on my several Ford based RVs. I now have a Chevrolet based class C and I was delighted to find that the holes in the wheels are large enough for human hands and it is a truly simple matter to check and add air in a normal manner with ho extensions at all. Why arenít all dual wheels made this way??!

I typically only adjust tire pressures twice a year. I have to add air for cold weather travel and sometimes need to adjust for warm weather. I have no problem using the factory short stems because the wheels on a Chevrolet chassis have holes that actually allow a human hand to fit. Imagine that!
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Old 10-07-2023, 08:05 PM   #10
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https://www.amazon.com/s?k=valve+ste..._ts-doa-p_4_10


I am not understanding an iota of this entire conversation.

It's not an aortic stent.
There is no need for precision past thread size and seal.
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Old 10-08-2023, 10:11 AM   #11
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Value Stem extenrera

2015 Thor Citation Nothing but low air. Two flat tires change on the road . Nothing but problems with extentions .Now I need a new tire. Having them removed oo n Tuesday.
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Old 10-10-2023, 05:47 PM   #12
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I agree with Duckface and I would suggest your local NAPA store for the parts.
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Old 10-11-2023, 10:25 AM   #13
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Our class C RV has a braided line coming from the inner dual on the rear tires. It is held with a folded piece of steel clamp that pinches the rim opening with a small pinch bolt threaded into it.

The fold of one of those clamps failed, the metal broke at that location, allowing the assembly to fall in between the two tires. The folded metal clamp, now broken, was the size of 2 guitar picks. While between the tires, it began cutting into the tire's sidewalls, causing one to go flat on the road.
As you may know. sidewall cuts are not repairable. Thus a new tire was needed.

Beware of my experience, and check yours for failure, if your RV uses this same system.
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Old 10-11-2023, 03:49 PM   #14
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Over 4 seasons of use, I've found I only need to adjust tire inflation on our class C once at the beginning of our camping season in April.

The inner duallies are the only ones I can't reach, so I use an extension. The ONLY thing installed on the factory valve stems is the TPMS sending unit.

The inconvenience once a year of fumbling with an extension FAR outweighs the inconvenience of a slow leak in a permanent mounted valve extension.

I've had zero issues with the factory stems... I like that.
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