Prepare the toilet turn the water supply shutoff valve clockwise to turn.
Toilet lock nut clockwise.
These are used in a toilet chiefly to secure the fill valve in the toilet tank.
Empty the bucket and place it underneath the water supply line.
Raise the pipeline from the overflow tube.
The end of the water supply line will come away from the connection.
I then would proceed counter clockwise with a second offset 6 pipe wrench and try to loosen the nut.
Remove the fill valve.
The valve is connected to a rubber ball float.
Lock nuts are used to hold fixtures securely in place from below.
Use a pair of pliers to just loosen the coupling nut.
Step 3 replace the valve.
Using various methods to remove the nuts and the bolts when the toilet bolt won t tighten gets your project back on track.
While turning these stabilize the bolt from above with a screwdriver.
Then finish loosening the nut with your fingers.
If the nuts don t have wings lock a pair of locking pliers around each one in turn.
To be honest before i grabbed the hack saw i would always set up a straight 6 pipe wrench inside the toilet tank and position it at the base of the fill valve with the handle up against the toilet tank.
When you unscrew the screw the pliers will hit against the toilet bowl and prevent the nut from turning and it will loosen.
Tightly secure the lock nut washer and nut.
Gently pull the nut down.
Some nuts have wings that you can grasp with your fingers.
Remove the nut washer and lock nut.
Use your pliers to loosen the nut under the tank.