Last night when I finished working on my project I drained the water from my compressor,going to prime 3 panels today. When I went to close the drain valve it wouldn't work. It had deteriated on the inside. 2nd time in the last 15 years. The ONLY piece of hardware I could find to have the same threads is an air tool fitting. I welded the tool end closed and threaded it right in. New ones (2-one for future) will arrive Thursday,I sure couldn't leave my compressor down till then. Hope it helps somebody else,If you didn't already know.