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If you have a crescent big enough to turn the female side of the union (the larger one), and a crescent on the smaller side (the side you can see the pipe dope, or threads that the female "nut" of the union attaches too), you should not even need a pipe wrench at all.
You may even be able to find a cap to fit over the male end of the union, so that you don't have to take the union off the pipe. That would be the best and easiest solution.
Bill
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