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It should be right above the water heater on the cold side. It is either a straight lever that is a quarter turn type or a round handle that screws in. If it is the straight lever one, you probably pull down on it to shut it off, but it can be put in either way and you may have to push it up. Look at where it attaches to the valve and you can see the stops and which way to turn it.
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How does a water heater vacuum relief valve look like?
Please see link below.
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