Step 1
Read the directions stamped on the valve handle sitting on top of the propane tank. Turn the valve in the direction designated as "Off" -- generally clockwise -- until it tightens to the tank.
Step 2
Adjust the size of a spanner wrench to fit the nut connecting the regulator to the threads of the propane tank. Hook the spanner wrench on the regulator nut.
Step 3
Turn the handle of the spanner wrench clockwise to loosen the nut. Tap the handle of the spanner wrench with a rubber mallet if the wrench does not turn by hand.
Step 4
Remove the loosened nut from the propane tank by turning it clockwise by hand until it pulls from the tank.