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

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

The Milwaukee® M18™ SWITCH TANK™ 4 Gallon backpack sprayer kit delivers the industry’s first interchangeable tank design with no manual pumping.

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Dewalt DCS391 - Can't change blade on circular saw because of stuck blade clamping screw - Home Improvement Stack Exchange

【Stable Performance】Flow control knob of mapp gas torch near the handle to adjust the gas of the propane torch kit. Metal pressure regulation allow

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