TireMinder transmitters can be used on both rubber and metal valve stems, however we do not recommend using flow-through transmitters on tow vehicles and rubber valve stems.
This is a TireMinder standard transmitter on a light truck with rubber valve stems.
Here is a TireMinder flow-through transmitter on the same light truck.
The TireMinder Flow-Through Transmitter is 1.89" long, meaning it will stick out further than the standard transmitter which can subject it to breakage should you ever get too close to a curb.