Install this:
The best among the brass ones.
Be sure to remove when your heater dies and reinstall on new one. No new WH valve can compare.
That plus a new anode rod will extend the life and performance.
The OP's may be too old for this however.
READ THE REVIEWS!!! Brass Water Heater Drain Valve | eBay
Unlike Freedom Flow, they are designed to drain the tanks of water. Using Freedom Flow can reduce monthly and long-range costs. If water heaters deposited in our landfills each year were laid end-to-end, they would extend from.
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The best among the brass ones.
Be sure to remove when your heater dies and reinstall on new one. No new WH valve can compare.
That plus a new anode rod will extend the life and performance.
The OP's may be too old for this however.