To make sure you hit the nut itself and not the surrounding threads place a center punch on the nut and strike the punch with a hammer.
Delta faucet bonnet nut stuck.
Turn off the water and turn faucet on.
How to remove a stuck bonnet nut from a delta 600 series shower trim kit.
Remove the faucet s bonnet nut.
This is sometimes also called a dome nut or dome cap.
The bonnet nut fits over the faucet valve and holds the valve into place.
Take an old wood chisel and gently start hitting the outside of the ring counterclockwise.
Then try to loosen it using a correctly sized wrench.
Moving the nut in any direction is progress.
Jarring the nut can break its bond to the bolt.
If that doesn t work right away try to break it loose by gently hitting the ring clockwise without twisting the fixture.
Tap with a hammer.
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Make sure you have a new replacement bonnet nut on hand before you cut the old one.
I will show you how i quickly.
Can t remove the handle or bonnet nut.
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Let it sit for 5 10 minutes.
To remove the bonnet nut turn it in a counterclockwise direction with a wrench until the nut is free from the threads on the valve then lift the nut up and over the valve to complete the removal process.