Install the Faucets
It is easier to put the faucets in before you install the sinks. For a typical three-piece faucet, run a flexible water supply line (Image 1) from the house to the base of each faucet.
Next, connect another flexible line from each valve to the mixer. As the cold water comes from the house, it goes into the cold valve. When the cold valve is opened, the water flows into the mixer (Image 2).
The water mixes with any water from the hot side and then comes out the spigot.
To attach the faucets to the sink, we remove the handles from the valves. Remove the top bezel and install the valve from the underside of the sink. Screw the bezel back onto the valve. A rubber O-ring on the bezel (Image 3) eliminates the need for plumber's putty or silicone.
Put the handle back on and repeat for the other side. If the handles don't line up properly, put them both in the off position. Then, take off the crooked handle and line it up and put it back on.