If you mean the drain valve, the cheapest, easiest fix is to buy a hose cap at the hardware store and cap it off. If you mean the relief valve which is located on the top or upper half of the heater, you must replace the relief valve. Do Not cap the relief valve it is a safety feature. If it leaks again you may have further issues
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If you mean the drain valve, the cheapest, easiest fix is to buy a hose cap at the hardware store and cap it off. If you mean the relief valve which is located on the top or upper half of the heater, you must replace the relief valve. Do Not cap the relief valve it is a safety feature. If it leaks again you may have further issues