What is the difference between these two TPMS systems.

No issues on inside duel at all.

Two Jayhawks wrote:
I wanted as petit a sensor as possible so I chose the non flow through & removed the anti theft casing. Theft is not an issue for me. Frankly if a tire needs air it's no more difficult to just remove sensor than it would be to remove the stem cap.

How difficult is it to attach th3 sensors to the inside duelly?

I have 6 flow through sensors on the RV and security cap non-flow through on the Grand Cherokee. I'm happy with both.

I have had the TST 507 system since last year and very happy with it. I have 12 sensors, all flow through. I like the flow through ones on the coach and have not noticed any problem with flow, but have only had to top up a couple of tires when I moved from hot Arizona to Cold Canada in April.

What others have said previously is true about the flow throughs on my toad (Jeep wrangler). I should have used the normal caps because the flow through ones extend too far out and are at risk when off roading. So far however, I have just removed them when I stay in one place for awhile. Easy to do. Probably later this year when I am back in the US, I will buy 4 normal caps and use them instead.

Exactly ^^ :R

I wanted as petit a sensor as possible so I chose the non flow through & removed the anti theft casing. Theft is not an issue for me. Frankly if a tire needs air it's no more difficult to just remove sensor than it would be to remove the stem cap.

Does anyone have any direct knowledge of a TPMS sensor theft? I've never heard of one, but I suppose it could happen. None of the so called "security" measures are actually very secure. Allen wrenches are common tools of course, and a crowfoot socket easily replaces the TST "special" tool, but the rotating cover cap sensors can also be removed simply by squeezing the cap with pliers. Personally, I prefer making the sensors less noticeable as a deterrent as well as for the ease of airing up.

mike brez wrote:

JoeH wrote:

rgatijnet1 wrote:
I had flow through sensors and never had any trouble with them. Airing up the tires was no more difficult than if they were not there. The advantage is that I could LOCK them in to position which discouraged theft of the $50 sensors.
The sensors that you have to remove to add air are either kept loose or you have to use an Allen wrench to loosen them each time you want to add air.

The TST's don't use an allen wrench-- there is a special wrench that grips the base of the sensor below the anti-theft collar that you use to remove it to add air. Takes the same amount of time as removing a standard valve cap.

X2 it's the same exact little tool to install or remove either style. There is no Allen key.
I have the standard 507 and removed the anti theft collars from all of sensors

You are right. My flow thru sensors used a common Allen wrench to lock them in place. With the other sensors, all you have to have is the SPECIAL wrench to remove the cap or remove the anti-theft collar.
I'll stick with my flow thru sensors that can be locked in place and need no SPECIAL wrench to just add air.

The flow-throughs air up slower, and on toad wheels can be subject to damage from curb rubs. I also see more leak complaints with them. I removed the security shells from my 507 cap sensors, which makes them smaller, lighter, and less noticeable. It also means I remove them just like a standard valve cap to air up, just like you do with the flow-throughs. I've been running them like that on both the coach and toad for going on 5 years with no problems.

A vote for no flow through because it takes longer to fill. BUT, I've heard that TST did a product improvement on them that solves that issue. So, I'd vote yes if that solved the problem. Support at TST is awesome. Had their products for many years.