How to Install a Basin With Plumbers Putty

Mark the location of the sink onto the countertop. Trace the template if one has been provided with the sink, but if not, turn the sink upside-down and trace the outline onto the countertop. Measure in about a quarter-inch from the edges of the outline, and draw a smaller rectangle inside the first one.

Drill a hole into each corner of the smaller rectangle on the countertop with a half-inch drill bit. Cut through the countertop with a jigsaw, using the pilot holes as a starting point. Prop up the center of the area you're removing while you cut to prevent it from tearing away from the countertop, which can leave jagged edges. Using the smaller rectangle allows the lip of the basin to rest on the countertop.

Turn the sink upside-down and slide the faucet through the designated holes in the basin and attach it with the washers and mounting nuts.

Roll plumber's putty between your hands and pack it around the underside of the lip of the sink strainer.

Slide the strainer into the hole at the bottom of the basin and install the washer and gasket over the bottom of the strainer -- follow manufacturer's instructions for precise installation. Screw the lock nut onto the bottom of the sink strainer and tighten it with a wrench. Wipe away any excess putty from around the drain at the bottom of the sink.

Place plumber's putty or silicone adhesive along the perimeter of the hole on the countertop. Read the instructions on the putty to see if it will have an adverse reaction to the material your countertop is made of.

Flip the sink over and insert it into the hole inside the countertop, pressing down firmly around the lip to ensure a tight seal. Wipe away excess putty from the edges of the sink.