Original valve worked after 4 years no more. I manually open it when draining the water heater so it acts as a vent and allows for quick draining. Last time I drained it, no more ventilation; the water flowed out slowly. Removing the original required removing the firebox cover and required some penetrating oil, care and patience to remove the valve. The new one is exactly the same with thread sealant already applied. Works well.
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