tools - knob of propane tank was stuck - Home Improvement Stack

I used the grill last year, and am planning to replace the propane tank. However, I found that I could not turn the knob. I marked the knob with red color in the following figure. I guess it maybe

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Grill propane tank stuck. Is it a loss? What I think is the valve turns to dust. : r/AskMechanics

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