If the nuts don t have wings lock a pair of locking pliers around each one in turn.
Toilet lock nut clockwise.
The end of the water supply line will come away from the connection.
Position the new valve in place of the faulty one.
Some nuts have wings that you can grasp with your fingers.
The valve is connected to a rubber ball float.
Raise the pipeline from the overflow tube.
When you unscrew the screw the pliers will hit against the toilet bowl and prevent the nut from turning and it will loosen.
Use your pliers to loosen the nut under the tank.
Use a pair of pliers to just loosen the coupling nut.
Remove the fill valve.
Empty the bucket and place it underneath the water supply line.
Then finish loosening the nut with your fingers.
Gently pull the nut down.
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.
The lock nut threads onto the fill valve inlet just above where the water supply hose or tube coupling attaches.
Tightly secure the lock nut washer and nut.
Remove the nut washer and lock nut.
Prepare the toilet turn the water supply shutoff valve clockwise to turn.
While turning these stabilize the bolt from above with a screwdriver.
Lock nuts are used to hold fixtures securely in place from below.
I then would proceed counter clockwise with a second offset 6 pipe wrench and try to loosen the nut.