Step 3 · Install Faucet and Drain Assembly
It is much easier to install the faucet and drain before the sink is mounted. Place the sink basin upside down on a soft, protected surface like a towel or piece of cardboard. Following the manufacturer's instructions, insert the faucet through the mounting holes on the sink deck. From the underside, attach and tighten the mounting nuts. A basin wrench can be very helpful for tightening these nuts in the tight space. For the drain, apply a rope of plumber's putty around the underside of the drain flange. Insert the drain body through the drain hole from the top of the sink. From underneath, install the gasket and tighten the large locknut to secure it. Do not overtighten. Connect the pop-up drain linkage as per the instructions.