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The green valve stem caps are put on there to let service personnel know that you are gullible enough to pay for such a scam. Or at least set up for the "Conversation" that you must maintain your tires with pure nitrogen so that they can relieve you of more $$$.
God help you if you should ever get some "Air" mixed in with your Nitrogen!
Someone needs to make the agnostic version of this cap.
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