Any time you replace an old faucet you have to take off the locking nut that holds the faucet tight to the countertop.
Delta sink faucet bonnet nut stuck.
The easy way to access a corroded basin faucet fixing nut for removal.
Here are some nut freeing tricks from richard trethewey.
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.
But often that nut will be frozen due to corrosion or mineral buildup from years of water seepage.
The stroke by billy squier permission to use in this video by the legend hims.
Put a wrench on the fixture or nut and strike the handle sharply with a hammer to loosen the fixture.
Make sure that the surrounding area is free of any valuable items as the action to strike the motion against the plumbing nut.
Sometimes you need a hammer to break the nut.
Apply heat to the stuck fixture or.
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.
The bonnet nut fits over the faucet valve and holds the valve into place.