Dislodging a stuck propane tank valve requires finesse to ensure you do not cause more damage to the handle. Lodged valves can be caused by rust formation, excessive tightening or a foreign substance impeding the valve's movement. Propane tanks are highly combustible, so avoid accidentally puncturing or otherwise damaging the tank. Protecting your propane tank from extreme temperatures and covering it to protect from water damage help prevent your tank from becoming stuck in the future.
Place the propane tank on a steady, flat surface. Make sure it is in a dry, cool area. Check the tank for any propane leaks or other obvious signs of damage to the tank.
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Wrap the rubber band around the edge of valve to improve your grip on the lodged valve. Twist firmly to dislodge the valve with your hand.
Spray lubricant onto the shaft of the valve. Jiggle the valve back and forth to loosen it, and attempt to twist it open again.
Grip the edge of the valve with your pliers firmly and twist counterclockwise to open it. Avoid using too much pressure or you risk breaking the valve entirely.