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Turn off the water at the shutoff valves underneath the sink.
Loosen the collar nuts on the curved section of the drain pipe called the P-trap. Place a bucket underneath to catch any excess water, then remove the P-trap.
Use slip-joint pliers to loosen the nut holding the pop-up assembly in place under the sink.
From overhead, unscrew the pop-up flange to free the assembly underneath the sink.
With the pop-up assembly out of the way, use a wrench to loosen and remove the fittings that join the old faucet's supply lines to the shutoff valves.
Using a basin wrench, reach behind the sink bowl and loosen and remove the supply tubes and the mounting nuts holding the faucet in place. Lift the old faucet off the sink. Use a rag or an abrasive pad to clean any residue left from underneath the old faucet.
You may want to use flexible connectors to replace the rigid tubes connecting the faucet to the shutoff valves. If so, connect them to the new faucet. Don't over-tighten.
Drop the new faucet in place, feeding the supply lines through the holes in the sink and making sure that the faucet's gasket seats properly.
Secure the faucet from underneath the sink with mounting nuts.
Connect the bottoms of the flexible connectors to the hot- and cold-water shutoffs. Tighten all connections.
With the faucet in place, begin installing the pop-up assembly. Push the pop-up rod down through the faucet body, and attach the flat bar.
Add a little plumber's putty to the bottom of the new flange, and hold the tailpiece so that the whole assembly protrudes up through the drain hole in the sink. Spin the ring to position it with the tailpiece underneath the sink.
Working underneath the sink, tighten the nut on top of the tailpiece to secure the pop-up housing in place.
Hook the pop-up lever onto the flat bar and secure it to the pop-up housing.
From overhead, drop the stopper into the drain hole. Work the pop-up rod to make sure the stopper works properly.
Replace the P-trap and tighten the collar nuts.
Turn on the water supply and check for leaks.
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