Bests & Worsts Reviews from Amazon

I agree with the other reviewers who said this product needs an o-ring. I found it very difficult to get it to seal on the tire valve stem, but with the o-ring it works perfectly. (Why they don't manufacture it that way I don't know). But by getting an inexpensive o-ring from Ace Hardware you have a product that is outstanding. Another reviewer said the size o-ring he bought was 1/4 x 1/8 x 1/16. However I found this size was too small and didn't fit. I had to get 5/16 x 3/16 x 1/16, and it's a perfect fit. And with tax it cost me a mere .18 cents. An easy modification well worth it.