But often that nut will be frozen due to corrosion or mineral buildup from years of water seepage.
Delta sink faucet bonnet nut stuck.
To remove a stuck faucet nut you need a wrench or locking pliers to break the mineral deposits grip and then turn in the opposite direction.
Put a wrench on the fixture or nut and strike the handle sharply with a hammer to loosen the fixture.
Here are some nut freeing tricks from richard trethewey.
Removing a stuck on bonnet nut when changing a cartridge on the delta shower valve.
Make sure that the surrounding area is free of any valuable items as the action to strike the motion against the plumbing nut.
Remove the faucet s bonnet nut.
Sometimes you need a hammer to break the nut.
If the fixture or nut hasn t loosened go to step 2.
Any time you replace an old faucet you have to take off the locking nut that holds the faucet tight to the countertop.
The stroke by billy squier permission to use in this video by the legend hims.
The bonnet nut fits over the faucet valve and holds the valve into place.