water heater drain cap

Greetings,
I have a water heater drain that drips even when turned off HARD. I would like to purchase a cap to screw over the drain. What type of threads does it have (garden hose threads?) and what is the type of cap I need called so that I can order it online? Can anyone suggest a good place to order such things online? Is there a different / better solution that will be quicker and cheaper?
Thanks, William
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if its a metal valve screw another garden hose valve to the first.
or regular caps are sold at home depot for a few bucks.
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snipped-for-privacy@wdeans.com wrote:

Go to your local hardware store and get a cap that fits a 5\\8" garden hose. I've done it more than once. This is probably a good argument for NOT periodically draining water heaters. I've drained some waters heaters I've owned and not others and the only consistent results I've gotten were leaky valves.
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If it HAD been drained regularly, then the valve would not have gotten crap in it and began leaking.
s
This is probably a good argument for NOT

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On Sat, 08 Sep 2007 18:05:46 -0500, Steve Barker LT wrote:

I'm not sure I believe regular draining prevents valve leaks, either. I just replaced the leaking (plastic) valve in my 6 yo gas water heater. I have drained only occasionally, and the water always came out clear. The old valve had no "crap", and was totally clean. I believe the washer had deteriorated and probably could be replaced to repair the valve.
I bought a quality hose bib (the ball valve kind) to replace the old valve. I thought I would have to totally drain the heater, but I didn't. I closed the inlet valve and put a bucket under the drain valve. I turned to pilot setting and waited a few hours for it to cool somewhat. I unscrewed the valve and although some water dripped into the bucket, it didn't all come out. I worked quickly to screw in the new valve with teflon tape. I doubt if over a gallon came out altogether. I suspect a vacuum forms that keeps the water from draining, as long as no taps are open.
I was too dumb to think of the cap trick, which would be less work. Probably cheaper too.
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