There's always an override button on the valve. Sometimes it's well hidden but most of the time a black "dot" or a chrome butterfly wing on the very top. They're built to be stealth so people don't abuse them, but they're there
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“Being tolerant does not mean that I share another one’s belief. But it does mean that I acknowledge another one’s right to believe, and obey, his own conscience.”
Viktor Frankl
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