Up north I would drain some water out of my water heater twice a year to remove some sediment. One time I did it I couldn't close the valve all the way and water kept coming out no matter that I closed the valve as far as I could.
I had to rush to the hardware store and I was able to get a cap that I screwed on the end of the valve to stop the water.
I'll never drain a water heater again.
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