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Carefully with a pair of needle nosed pliers. Open them up enough to fit the tips in the slots, then use that as a wrench to undo it. I mean carefully because the outer edge is brass and you'll chew it up nice. Before you do it, go to an auto supply shop and pick up a tube of gasket sealant goo. When you have your valve out, wipe some of the good around the threads, then screw it back in avoiding cross threading. The goo will harden up a bit and prevent leakage around your threads.
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