I ordered one 5 years ago to replace a worn one. I also ordered a new Hunter aligner. After the equalizer was installed, it was used on the first car and the inflator was left wide open. Bad air valve in the tool right out of the box. I disassembled the air valve several times, worked once, then jammed again. The spring and the stuffing box in it are bad, the stuffing box rolls every time. Of course, after the return period has expired, since I didn't use it right away.