Tire Valve Stem Extender
I have not been too use them!!

Shipping charge
Shipping charge Was ridiculous for an extremely small item tire valve cost more to ship than the cost of the product though the product is of high-quality

Extenders
Arrived on time and worked as intended.

One of two failed
Bought for the front tires with Alcoa rims. Was starting off on an 8 day trip, 50 miles from home and the right front tire started to show a drop in pressure. A few miles more and a further drop was indicating. Stop and checked, the extension was not fully engaging the tire valve steam (and wouldn’t, even after several on/off attempts). Luckily, I didn’t really need the two extensions after all, thus I removed them both and continued on. A bit expensive as compared to other similar units available. I bought these from RVi with the expectation that they were high grade and fully tested for the Tire Patrol, however my experience wasn’t as expected.