I am in the midst of this right now. The plug, for whatever reason, pulled off the brass end at the bottom. When you opened the faucet, it would run, but not alot, and it did shut off when you turned it off. I messed with it for a couple of hours trying to get the plug out, ended up digging out the hydrant. Bought a new one and will finish up the install tomorrow.
This one is only 4 ft total height (2 ft bury), would hate to have this happen to one buried six foot or so, in an area with a deep frost line.