I originally bought them to release compressed air. After a week or two, the rubber ring will come loose and begin to let air through. Now I realized that they are not actually designed to release compressed air, they are designed to release water from the tank when there is no air inside. So if you want to drain the water this will work, but I wouldn't recommend using it to drain real compressed air or the rubber o-ring will eventually break. So don't get me wrong, this is a good product, I just used it wrong. I have now switched to a ball valve to release the compressed air.
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