Ford F150 - Tire Pressure Valve Caps

I was in my local AutoZone today and seen these tire preasure valve caps, I have'nt seen anything like it and was wondering has anybody seen these or have used them, seems like a good idea was'nt to bad in price either, around ten bucks. Thinking about getting some.

I had them. One of them started leaking where the clear top joins the chromed part, so i junked them...

Agree with exgmman!
I had them to keep wife's tires safe, instead she ended up with a flat because one leaked, and if it comes just a little lose, it leaks. Now she has a digital LED tire gauge instead.

Ok thanks for the heads up.

Friend has them on a Mazdaspeed Miata and they seem to be fine so far. I was considering getting some.

My wife had them on her windstar, they sucked. Inaccurate and leaked, but that several years ago, may be better ones now