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Today, most new faucets come with a matching pop-up drain plug and trim piece. Whether you’re replacing an existing drain, or installing a new one, this is usually not a difficult task. The steps below describe how to properly install most common pop-up drains that accompany new bath faucets.
Apply Plumber's putty
If the sink is not supported with a cabinet, use a 2×4 to support it while you’re working. Cover the bottom of the flange with a rope of putty.
Thread the locknut onto the drain body
Add the friction washer and beveled gasket.
INSTALL THE DRAIN BODY Install the drain body
Push the drain body up through the lavatory hole from underneath. Place a rope of putty under the drain flange, insert it into the hole from above, and screw it onto the drain body.
Tighten the locknut
Hold the drain body still while you tighten the locknut, first by hand and then with water-pump pliers.
Turn the drain body to the rear
This will line it up with the pop-up linkage. Apply silicone caulk at the drain and Teflon tape at the extension piece to seal the drain tube. Inside the sink, remove any excess putty with a plastic putty knife.
Install the drain plunger
Slide the plunger into the drain opening.
Insert the ball into the opening
The ball should fit snugly into the opening in the drain tailpiece.
Thread the ball nut hand-tight
Slide the ball nut over the arm and screw it onto the threads of the drain tailpiece
Set the pop-up arm
Slide the arm through the nearest hole in the lever strap and fasten it with a clip. Connect the P-trap. Test the pop-up drain. Adjust the arm, if necessary.
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