The valve on my agricultural tractor tire was leaking and when I tried to pump more air I found the small inner valve stem was broken and not holding air and fluid to fill. Since I live far from the city, I borrowed it from a neighbor. When I finally got into town I thought I'd be easy to find but found that my local farm shop was out of stock and none of the nearby auto shops had them, but I had to order them for myself. I decided to look on Revain, found these and ordered a pair. Arrived quickly, gave one to a neighbor to fill up and put the other on my opposite tire as I hadn't fitted tires in years. On a personal level I find it very well done and would recommend it to anyone. Plan to order another pair to have on hand. Plus, they cost almost half what it would cost at my local farm shop.