This did not work properly at first. This would provide the correct tire pressure but would not hold the reading. Immediately started dripping. I unscrewed the end of the hose, found a spring and 2 small washers (clear plastic and black, black goes on top) - the black washer was upside down and wouldn't close. I flipped it, reassembled it and now it works great. I also stretched the spring a bit for a tighter fit. Ideal for motorcycles with wire wheels where they fit snugly.