1/2" NPT threaded cap is a good replacement for caps on drains on water heaters that you may have lost or misplaced. It's also used to run pressure tests in newly installed freshwater lines.
WOW! I am impressed! I called to place my order and real person answered, spoke perfect English, albeit a slight southern accent, and my order was sent within a day, shipped quickly and I had it a few days later. I saved over a hundred dollars over local and installed it my self. I cant imagine how that they could do any better. THANKS!