What are the installation steps for a Moen pop-up drain in a bathroom sink?
To install a Moen pop-up drain in a bathroom sink, first, remove the old drain. Then, apply plumber's putty to the underside of the new drain flange and insert it into the sink opening. Secure it in place with the provided nut. Next, connect the horizontal rod to the lift rod and insert it into the drain. Finally, adjust the lift rod to ensure smooth operation of the pop-up drain.