Originally Posted by dynamicS
I believe it's designed to act as a barb for the plug, because on those other plug kits you buy at Pep Boys, they don't use the brass barb. They are known to get pulled out of the tire during hard acceleration, and thus leaving a big hole for air to escape, very dangerous at any speeds.
I use them all the time but only on the wheels that ARE NOT driving the vehicle!
Ok, that makes sense. I didn't think about it like that. I'd like to purchase a kit and inspect it a little closer, but it seems like a good thing to carry in a car that doesn't have a spare tire.