Drain valve is leaking. - Rheem Water Heater Drain Valve

Use garden hose cap:
http://waterheatertimer.org/How-to-replace-water-heater-drain-valve.html
http://waterheatertimer.org/Leaking-water-heater.html
Make sure you are not capping off TP valve:
http://waterheatertimer.org/How-to-replace-TP-valve.html
Identify water heater valve:
http://waterheatertimer.org/Repair-water-heater-valve.html

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Copy following link:
http://waterheatertimer.org/How-to-replace-water-heater-drain-valve.html#repair

2) You may find it is easier to put garden hose cap over dripping drain valve.
Screw very tight with channel locks.
http://waterheatertimer.org/How-to-replace-water-heater-drain-valve.html

3) Add comment and say what you discover

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

If the drip is coming out of drain valve: Put a hose cap over end of drain valve.
If water is seeping out of cracked drain vale, then replace it.
If the leak is seeping around previously sealed threads, then tank may be rusted beyond repair.
http://waterheatertimer.org/How-to-replace-water-heater-drain-valve.html
http://waterheatertimer.org/Leaking-water-heater.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Easiest to put hose cap over end of drain.
Open following link for resources and illustrations:
http://waterheatertimer.org/How-to-replace-water-heater-drain-valve.html

If you mean the drain valve, then buy garden hose cap at home center.
Cap will have rubber washer that seals tank.
If drain valve is plastic, the cap may not thread on without sanding down end of plastic drain valve.
Otherwise replace drain valve, which is simple if drain valve is brass, but can be difficult if drain valve is plastic.
Turn off power to water heater: Electric: turn off circuit breaker. Gas: turn knob to pilot.
Turn off water, open bathtub spigot on Hot side, drain water heater, remove drain valve with wrench.
If plastic drain valve breaks while being removed, then 'gently' break out broken part using hammer and big screwdriver.
Buy new drain valve at box store in water heater department.
Put teflon tape on new drain valve threads.
http://waterheatertimer.org/Water-heater-is-leaking.html
http://waterheatertimer.org/Water-heater-will-not-drain.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

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Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
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You can try to crack it open and get a little piece of crud out of there, I'm sure that is all it is, Just get a tray or something to catch the water, It should stop it, If it gets worse, turn the water off to the heater, then open the valve and hope the bigger piece of crud comes out. It is about all you can do, other than drain the whole thing and take the valve apart and replace the rubber in it. Check it out, Hope this helps.

If it is plastic I would change it out and replace it with a brass drain valve. Some may call it a boiler drain valve. Depending on condition of the valve you currently have will determine if it is repairable.
You have to drain it down to repair and it would just be as easy to replace it since you drained it.
Most hardware stores should carry this valve
Below is a link with some information about upgrading the drain on the heater to avoid problems.

http://ezinearticles.com/?Avoid-Leaks-At-The-Bottom-Of-Your-Water-Heater:-Upgrade-Your-Drain-Valve&id=267639

If you're sure it's the DRAIN, just get a garden hose cap for it (your other option is to replace the valve - drain tank, replace valve, refill).
NEVER CAP THE RELIEF VALVE DRAIN!

drain valve must have already been leaking, that's why someone put the cap on. It's ok to cap the drain but never the pressure/temp relief. If the water is coming out of the drain (not around it) you could either replace the cap or the drain valve to stop the leak - otherwise it's time for a new water heater.

You have two choices. First make sure you are dealing with the drain valve and not the temperature and pressure relief valve. Then you can either cap the drain valve with a garden hose cap or you can drain the water heater and replace the drain valve - if you chose replace make sure you get a water heater drain valve (3/4" MPT).

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