Originally Posted by Crossingover
Thanks for the PSA. Our inner wheel extensions are bolted to the rim and are clear of the wheels and I frequently check that they are. You can buy a rubber diaphragm to isolate and center the stem in a wheel slot but I have no need for that. You might consider such a fix. At your next tire change you should replace the screw-on valve extension with one that is bolted direct to the rim.
I have never worried about that issue either... and don't want to need the rubber boot either. I can access the original style stems just fine, no extensions needed or wanted with our TPMS. We follow the FMCSA regulations too.