What is Purpose of Screws of Replacement O-Rings for TST 507 Series TPMS Sensors for RVs
Updated 02/16/2026 | Published 02/09/2026
Question:
What are the 18 screws for?
asked by: Ty
Expert Reply:
I am not sure. The sensors do not come apart with screws as they basically just unscrew themselves so I don't think the includes screws of the # TST84FR are actually needed and would be included by accident.
John T.
2/13/2026
The screws are replacements for the originals in the cap sensors. Mine were pretty rusty after 10 years. Each sensor has 3 screws holding the outer shell on which is there to prevent the sensors from being taken off without the proper tool. BTW they give you extra screws over the 12 required.
Charlie Z.
2/13/2026
There are two different sensor types, cap and flow through. I have the cap style sensors and have purchased the O ring kit. I don't recall receiving any screws with the kit and screws are not required/used for the cap style sensor. Can't speak to the flow through.
Wally O.
2/13/2026
Yep, the screws are there to be replaced when you replace the gasket or perform any maintenance on your sensor. if you have a question about the O-rings, they did not work for me and I ended up having to buy a brand new sensor.
Product Page this Question was Asked From
Replacement O-Rings for TST 507 Series TPMS Sensors for RVs
- Accessories and Parts
- TPMS Sensor
- Tire Pressure Monitor Parts
- O-Ring
- TST
more information >
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Jason
2/13/2026
The screws hold the outer shell on the sensor. The shell helps with weather and security (why the wrench is needed). The screws are small and should be replaced when you change the battery as they are likely weathered. If you don’t see the screws your outer shell ma be missing or a different model.