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Flow Through Tire Sensors for TST TPMS - Qty 2

Flow Through Tire Sensors for TST TPMS - Qty 2

Item # TST-507-FT-S2
Our Price: $106.00
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Shipping Weight: 0.23 lbs
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Flow through sensors for your TST TPMS let you inflate or deflate your tires without removing them from the valve stems. Use them to monitor 2 additional tires, to replace damaged or lost sensors, or to upgrade from sensors that require removal. 1-800-940-8924 to order TST accessories and parts part number TST-507-FT-S2 or order online at Free expert support on all TST products. Great prices and Fastest Shipping for Flow Through Tire Sensors for TST TPMS - Qty 2. Accessories and Parts reviews from real customers.
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TST Accessories and Parts - TST-507-FT-S2

  • TPMS Sensor
  • Tire Pressure Monitor Parts
  • Sensors
  • TST

Flow through sensors for your TST TPMS let you inflate or deflate your tires without removing them from the valve stems. Use them to monitor 2 additional tires, to replace damaged or lost sensors, or to upgrade from sensors that require removal.


  • Flow through sensors for your TST tire pressure monitoring system let you inflate or deflate your tires without removing the sensors
    • Allow you to monitor 2 additional tires or replace lost or damaged sensors
    • Work with TST-507-FT-4-C and TST-507-FT-6-C
    • Can also be used to upgrade TST-507-RV-6-C and TST-507-RV-4-C
  • Brass construction designed for use on steel, chrome, or nickel valve stems
  • Easy installation onto your tires' valve stems with included wrench and locking hex nuts
  • Included replacement hardware may be required when changing batteries
    • 2 O-rings and 2 washers help maintain internal waterproof integrity
    • 5 Screws hold sensor body together


  • Dimensions (each): 1" diameter x 7/8" tall x 2-1/8" long
  • Pressure range: 0 psi - 196 psi
  • Operating frequency: 433.92 MHz
  • Operating temperature range: -40 F - 176 F (-40 C - 80 C)
  • Storage temperature range: -40 F - 185 F (-40 C - 85 C)
  • Battery life: 1 year - 1-1/2 years
  • Quantity: 2 tire sensors
  • 3-Year limited warranty

Tire Sensor Installation

Tire sensor Install Diagram

  1. Screw the anti-theft hex nut onto your tire's valve stem threads until it bottoms out.
  2. Screw the sensor onto the valve stem. Tighten the sensor until the air stops leaking and the sensor bottoms out on the valve stem. Give it a slight twist to seat the sensor while being careful not to over-tighten.
  3. Use the included wrench to tighten the hex nut counterclockwise until it is snug against the sensor.
  4. Screw the tire's valve cap onto the sensor.

TST-507-FT-S2 Flow Through Transmitters for Truck System Technologies Tire Pressure Monitoring Systems - Qty 2

Customer Satisfaction Score:

Customer Reviews

Flow Through Tire Sensors for TST TPMS - Qty 2 - TST-507-FT-S2

Average Customer Rating:  4.8 out of 5 stars   (91 Customer Reviews)

Flow through sensors for your TST TPMS let you inflate or deflate your tires without removing them from the valve stems. Use them to monitor 2 additional tires, to replace damaged or lost sensors, or to upgrade from sensors that require removal.


Saw these on YouTube and knew the necessity as my brother, a long-haul truck driver and 5th wheel RVer, says TPMS is a MUST. I have 6 wheels on my 5th wheel and just got 6 new Michelins on the pickup. I now have my pickup, 5th wheel, flatbed, and all of their spare tires monitored. Peace of mind is a wonderful thing when going across Wyoming at 80mph in 100 degree heat.
(Update) 70K miles in 8 months and this TPMS system is spot on. Thank you to for getting the correct sensors for my system in a fast and efficient manner. Great service at a great price. Very happy with my purchase.



One year of safe travels with my TPMS system for my pickup, 5th wheel and flatbed trailer. Travel is so much more satisfying when I don’t have to stress about the tires.


I've used the Roadmaster Hitch Mounted Spare Tire Carrier for the last year (2023) and have put over 7500 miles on it. The carrier has performed seamlessly and is still manageable when mounted 40 plus inches off the ground. I have it attached to a Torklift 5' extension that goes into a 3" receiver welded into my flatbed. To prevent bouncing I've had Torklift put in a support bracket from the lower(regular) receiver. No bounce!


Does exactly what it needs to do. There was an issue with the hubcap opening not allowing installation. Had to use valvestem extensions to facilitate installation.


Matches sensors received in a recently purchased tire monitoring system.


Needs metal valve stems which etrailer representative says the do not sell. They are listed on their web site. After getting nowhere with etrailer representative decided to return these flow sensors. Not worth the hassle.

Etrailer Expert

Jenny N.


I apologize for any miscommunication that happened. Part # AM20906 will work together with part # TST-507-FT-S2. You just have to make sure your tire is one that is rated for a PSI that is over 100. The rim would need to have valve stem holes that are 0.453 or 0.625 inches in diameter.


The weight of these add-on sensors flexed the valve stems on all four trailer wheels. Two of the four went flat during the trip. The other two I could pull the core out after we got home. The flexing caused heat in the rubber parts and disconnected the inter mail tube from the rubber. There should be a “steel stem only” notice on the product listing.


I purchased 6 tst internal sensors for our RV with the color monitor. I also purchased 4 flow-through monitors for our jeep, which we tow. The products are awesome and saved us from destroying tires on the RV. On RV’s with dual tires in the back, the inside tires get extremely hot in high summer time temperatures. The sensors taught us not to drive when ambient temperatures are 95 or higher. We have read where numerous RV’ers have had catastrophic blowouts on inside dual tires and our tst sensors allow us to avoid those dangerous situations. We absolutely feel the product should be installed on all R’s and trailers.


Would not be without a TPMS on my RV. This system has worked flawlessly. As a reminder, make sure you replace the rubber valve stems in your wheels with metal ones before installing these sensors.



One year later and could not be happier. We are full time on the road in our RV and depend on this system to alert us if we have a tire going down before we see the smoke and damage in the rear-view mirror. Over 5 years on the road, we have lost some tires, but none sense we installed this system.


I have a 7 year old TST TPMS that had a misbehaving sensor. Advice from TST was to replace the sensor. eTrailer offered the sensors at a reasonable price, had them in stock and offered free shipping. The 2 sensors arrived earlier than originally estimated. Sensors have been installed and all is well in TPMS on my MH.


They work great, gives tire pressure and temp. I have had the TST system for about 6 years now and the only reason I needed to replace these were due to the tire company putting them on too tight and broke them.

Garry H.


Great, perform flawless, remove them yourself if needing tire work done, destroyed 2 of them with excessive tightening.


Warned me of a double blowout on my triple axle boat trailer so I could get off the Florida Turnpike as soon and safely as possible without destroying the rims or damage the trailer and boat.


I purchased this a year ago and finally installed the system prior to a long trip with my camper. Once paired the system gave us an additional sense of security as we traveled. Great product.


Added 4 more sensors to our existing system and programmed them as a second trailer. 1000mi road trip next week, the system has saved us on our 5th wheel, and it will be nice to have piece of mind pulling our car trailer as well.


The sensors provide valuable temperature and pressure information to the dash mounted display in a five second alternating pattern. That makes it easy to read the information without distraction.


TST TPMS Flow Through Tire Sensors in my opinion are the best in the market place especially for rear duels on your coach. Easy to setup and maintain tire pressures. I have had this setup for a year. The TST display is second to none!!!!!!!!!!!!!


Ordered these replacement sending units for the system on my motorhome. One of the existing senders went bad so now I have one as backup. Sending units had to be of the same brand of TST TPMS. Replacement was quick and easy although the locking system has changed.


Great system! I would recommend this to anyone who is towing a RV or trailer. It does a great job monitoring pressure as well as tire temperature. Should not be towing without monitoring your tires pressure and temperature. A happy user!


These are extras. I have been using these for several years. They work great.I only had one false alarm. Rebooted recieverand all was well.



All is working well.


The only Tire monitor system to buy! we have them on our triple axle DVR Santa Fe and our M102 Freightliner tow vehicle.





Easy to use! Peace of mind on the highw ay.


The TST tire sensors have saved our bacon on two separate occasions when we had a tire fail on our travel trailer. The big thing to remember for this product is the need for METAL valve stems. A definite must have piece of kit for on the road safety.


Adding a TPMS to all eight of our wheels was the best investment we've made in years. Twice it has alerted us to a concern that would have become an issue had we not paid attention. As we prepare to head out for a couple of months on the great open road once again, we decided it was "worth it" to run with a couple of spares in stock (since one of sensors has been a little slow to show up on the monitor and we're beyond warranty).


Like the new sensor!. Had to replace an older (set screw) model that got damaged. New sensor coded up first try, installed easy. Very much appreciate the new locking nut versus the set screw. To be honest I never was able to tighten the old style set screws on all 6 wheels anyway. The locking nut and tool give an added sense of security. Just installed today, so no long term assessment yet.

As usual excellent service and turn time by etrailer!


I had to buy four TST 507 flow through TPMS sensors for my Jeep that I am towing behind my RV... I have used this product (for going on 5 years now) with three different RVs and would highly, highly recommend them. They work they do what they're supposed to do and they protect you What else do you need to know.. buy them!!


Perfect replacement for a lost sensor, and now I have an extra for the Spare.

Show More Reviews

See what our Experts say about this TST Accessories and Parts

  • Replacement TST Flow Through Sensor for the TST 507 Series TPMS
    Sorry to hear about that Jeff, we've all done it before! As far as a single replacement sensor, you're out of luck as TST only offers a 2 pack for a replacement # TST-507-FT-S2. It may-be better anyways that they're shipped in quantities of two just in case you break another in the future.
    view full answer...
  • Valve Stem Flow Through Sensors for Tire Pressure Management System
    The Flow Through Tire Sensors for TST TPMS - Qty 2 # TST-507-FT-S2 comes with the nut that fits on the valve stem behind the sensor. This nut and the special wrench will allow you to tighten that nut to the sensor from the back to secure it to your valve stem for increased security. You are correct that the nut and wrench are on the input side of the sensor and not the output so I'll have that photo removed as it is incorrect.
    view full answer...
  • Can Flow Through Tire Sensors for TST TPMS # TST-507-FT-S2 Be On Boat Trailer and Back into Water
    The sensors that mount on the wheels of the Flow Through Tire Sensors for TST TPMS # TST-507-FT-S2 that you referenced are water proof.
    view full answer...
  • Can You Manually Test the Tire Pressure While the TST Pressure Sensors Are Installed
    Yes. The Flow Through Tire Sensors # TST-507-FT-S2 allow you to fill, deflate and check the air pressure manually.
    view full answer...
  • Why Would Tire with TST Tire Pressure Monitor System Show Only 1 psi
    Is it possible the valve stem was damaged on the wheel that only shows 1 lb when you removed the sensor? I'd try pressing the valve to see if it lets out air like normal. My guess is it's damaged or obstructed.
    view full answer...
  • TPMS System for Dual Rear Wheel Motor Homes with Valve Extenders
    The TST TPMS for RVs part # TST-507-FT-4 is ideal for your situation. It offers 4 flow through sensors. These sensors will attach to your factory valve stems then your extenders can attach to them. This will eliminate the issue with the excess weight of the sensors being to great on the end of the extenders causing them to fail. This will take care of the 4 rears now for the 2 fronts use the Brass Tire Sensors for TST TPMS part # TST-507-RV-S2 which will give you the two standard front...
    view full answer...
  • Tire Pressure Monitor System that Can be Used on Triple Axle Trailer up to 100 PSI
    The TST TPMS for RVs - Color Display - Signal Booster - 4 Flow Through Tire Sensors # TST-507-FT-4-C is rated for up to 196 psi so it would work with the pressure ratings of both trailers you mentioned. To add more sensors you'd want the part # TST-507-FT-S2 for a pair. For a triple axle trailer you'd need the 4 sensors of the kit plus two additional sensors.
    view full answer...
  • Additional Sensors Needed For A TST 507 TPMS System
    If you're wanting to get just the sensors for your TST-507 # TST-507-FT-6-C system then you can get additional sensors with part # TST-507-FT-S2. Since the additional sensors only come in a 2-pack you will need to order two to get enough sensors for your Jeep.
    view full answer...
  • Recommended TST TPMS System for 30 Foot Trailer and 2019 Chevrolet Silverado 2500 HD
    If your 2019 Chevy Silverado 2500 HD Duramax already has a built in TPMS, I don't think you'd need to add the additional sensors to the TST TPMS for RVs - Color Display - Signal Booster - 4 Flow Through Tire Sensors # TST-507-FT-4-C, but I would definitely consider it. The great thing about adding sensors to this system and not using your vehicle's monitor, is that you can monitor everything on one monitor, as opposed to two. The TST system has an easy to read monitor that can be setup...
    view full answer...
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  • What Tire Sensors Can I Use With The Factory TPMS System On My 2021 GMC Sierra 3500HD Denali?
    The only trailer tire sensors that will work with the factory TPMS on your 2021 GMC Sierra 3500HD Denali is the GM kit 85110397 that is sold through GM. These sensors will need to replace the valve stems on your trailer wheels. I recommend staying with a system like the TST TPMS # TST-507-FT-4-C. These sensors will monitor the pressure like the GM sensors but unlike the GM sensors they are easier to install and can monitor the temperature inside the tire. This will help you to see if...
    view full answer...
  • Replacing Damaged or Lost Sensor on TST TPMS TST-507-FT-6-C
    According to my contact at TST, there are two scenarios that would indicate a sensor failure on your TST TPMS # TST-507-FT-6-C. If the battery is dead or sensor communication is interrupted temporarily, lines or dashes "---" are displayed for that sensor on the monitor. Since the battery life on the system can be anywhere from 12 to 18 months, this is unlikely. Also, the system automatically refreshes to display new information every 5 minutes, so the dashes would not be displayed for...
    view full answer...
  • Can You Mount The TST TPMS Signal Booster On The Back Of The Towing Vehicle?
    In mounting the signal booster for Truck System Technologies RV Tire Pressure Monitoring System # TST-507-FT-6-C, you ideally want it on the front end of the trailer that you are pulling in order to ensure a good signal. However, I did confirm with my contact at TST that you are able to mount the signal booster on the back of your pickup. You could then tap into the trailer hitch wiring to get the 12V that is needed to power it. You can use this system with up to 38 tires by adding extra...
    view full answer...
  • Can 2 More Flow Through Sensors Be Added to TST TPMS For Towing a Boat Trailer
    Yes you can! In addition to the TST TPMS for RVs # TST-507-FT-6-C you just need the Flow Through Sensor Kit # TST-507-FT-S2 that comes with 2 more sensors you can add to this monitor. You'll just go through the same pairing procedure with these as you will with the sensors that come with the kit. Attached are some review videos for you to check out.
    view full answer...
  • Can TST TPMS 433.92 MHz Signal Booster Work with 2024 Chevy Silverado TPMS 433 MHz System
    According to my research the TST Signal Booster / Repeater # TST-507-R won't work. People have tried different aftermarket solutions but none of them have been able to communicate with the OEM TPMS on the newer GM trucks as of yet. I read that GM is in the process of making one but we both know to take that kind of news with a grain of salt and not to hold our breath. If you'd like more of an immediate solution then I recommend picking up a whole TST TPMS System # TST-507-FT-4-C. This...
    view full answer...
  • Adding A Trailer Tire Pressure Monitoring System To An Existing Motorhome System
    The # TST-507-FT-S2 will work though these cannot be used on rubber stems and you will have a higher chance of curbing because these stand out a bit. I did contact TST who recommended the Brass Tire Sensors for TST TPMS - Qty 4 # TST-507-RV-S4 as a better solution that addresses those concerns. Either will work for you but I wanted to make sure you're aware of your options. Included are review videos for your review.
    view full answer...
  • Replacement Options For a TST TPMS Sensor with a Cracked Cap
    We do not have just the cap for TST TPMS sensors, and I am not aware of just the cap being available at all. For replacement options we have the Brass Tire Sensors for TST TPMS # TST-507-RV-S2 and the Flow Through Tire Sensors for TST TPMS # TST-507-FT-S2.
    view full answer...
  • Are The TST 507 Tire Sensors Compatible With the New 770 Series Color Monitors?
    The new TST 770 series screens are compatible with the TST 507 tire sensors manufactured with a date code of 4519 and later. You will be able to use the Internal Tire Sensor # TST-507-INT-S1 with your monitor. We also have the Brass Sensors # TST-507-RV-S2 and Flow Through Sensors # TST-507-FT-S2 if you want to add additional sensors without having to dismount a tire.
    view full answer...
  • TST Sensor Type Compatibility With TST TPMS for RVs # TST-507-FT-6-C
    You will be able to use the Brass Tire Sensors # TST-507-RV-S2, Flow Through Tire Sensors # TST-507-FT-S2 and Internal Tire Sensors # TST-507-INT-S1 with your TST TPMS for RVs # TST-507-FT-6-C. You can set up your TST TPMS to monitor up to 38 tires on 4 different vehicles.
    view full answer...
  • How to Monitor Tires on 2018 Ford F-250 with TST Tire Pressure Monitoring System for Trailer
    The TPMS on your 2018 Ford F-250 are using their own system and it won't be compatible with the TST TPMS # TST-507-FT-4-C that you are using for your trailer. If you wanted to use the TST to monitor the tires on your F-250 as well then you'll need to install some TST sensors on your truck tires. You can either use more of the Flow Through Sensors # TST-507-FT-S2 (which comes with a quantity of 2 sensors) or you could mount the Internal Sensor # TST-507-INT-S1 on all 4 wheels but this option...
    view full answer...
  • Recommended TPMS for 18 Wheeler
    The TPMS I recommend for an 18 wheeler is the TST TPMS for RVs part # TST-507-FT-6-C because it has a range extender and uses flow-through sensors which are both things you will need. The range extender will be needed as 18 wheels are generally pretty long in overall length and the flow-through sensors are needed because most dual tire applications use valve stem extenders and you'll need to install the sensor between the wheel and extender in order to get the proper reading. For extra...
    view full answer...
  • Tire Pressure Monitoring System Recommendation for 2017 TIffin Phaeton AH Towing Jeep Wrangler
    Since your 2017 TIffin Phaeton AH has 6 tires and your 2021 Jeep Wrangler has 4 you'd want the TST TPMS for RV's part # TST-507-FT-6-C which is a system that comes with 6 sensors and then two additional part number # TST-507-FT-S2 which is a pair of sensors you can use for the remaining four you need. This will give you an accurate and reliable setup with a long reception range and since the sensors are flow through you can inflate/deflate the tires without having to remove the sensors.
    view full answer...
  • TPMS System With 8 Flow Through Sensors and Signal Booster
    Truck Systems Technologies (TST) doesn't offer a TPMS kit with 8 sensors, but you can get the 6 sensor system with the pass thru sensors and signal booster, part # TST-507-FT-6-C and then add two additional sensors using part # TST-507-FT-S2. If you click the provided link, you can see a product demonstration video of the # TST-507-FT-6-C TPMS system.
    view full answer...
  • Recommended TPMS System For Use With a Motorhome and Flat Towed Vehicle
    I recommend the TST TPMS for RVs # TST-507-FT-6-C for your motorhome and towed vehicle. This system uses flow through sensors that make adding air to your tires when they are low much easier. The kit comes with 6 sensors and you can add up to 38 different sensors allowing you to use the main unit with multiple vehicles and even load up to 4 different vehicle profiles. By adding the 2 additional sets of the Flow Through Tire Sensors # TST-507-FT-S2 you will be able to use the monitor to...
    view full answer...
  • Recommended TPMS for Motorhome and Tow Vehicle
    The TST TPMS for RVs part # TST-507-FT-6-C is what I recommend using to monitor the tire pressures on both the motorhome and towed vehicle. This system uses the flow-through sensors which will be best because motorhomes usually have valve stem extenders which interfere with the other cap-style sensors. The monitor is powered via a cigarette lighter plug which could be modified to wire directly to the battery but this is not something I can recommend. The system will show the psi inside...
    view full answer...

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