Installing Bathroom Sink Drain

When installing a new bathroom sink, replacing the sink drain is part of the job. Installing bathroom sink drain the right way to avoid leaks and potential cabinet damage down the line. To install a bathroom sink drain, all you need are some basic plumbing tools and a little know-how. Bathroom drains are fairly simple objects with three basic parts: the tail pipe, a length of straight pipe usually made of metal or PVC, a drain and a pop-up plug, and the lock washer.

Bathroom Sink Drain Installation

Bathroom Sink Drain Installation

Installing Bathroom Sink Drain: Step by Step

  • Remove the existing sink drain, or install the sink in the counter top, if applicable.
  • Unscrew the drain lock nut from the tail pipe threads with a wrench and remove the lock nut. Leave the rubber washer on the drain. If there is no washer, put a ring of plumber’s putty around the bottom of the drain plug flange.
  • Slide the new sink drain into the sink’s drain hole. The flange around the pop-up plug sits on the rim of the sink drain hole. The rubber washer sits between the metal drain plug flange and the sink.
  • Thread the lock nut onto the bottom of the drain tail pipe below the sink. Tighten the lock nut with a wrench to compress the washer and secure the drain to the sink. Do not over tighten, just enough to form a water tight seal so no leaks occur.
  • Assemble the p-trap.

How to Install a Bathroom Sink Drain

How to Install a Bathroom Sink Drain

  • Slide the lock nut and compression washer over the bottom of the drain tail pipe.
  • Insert the tail pipe into the vertical end of the p-trap. Adjust to align the back of p-trap with the drain line in the wall. Tighten the lock nut with a strap wrench or regular wrench once aligned.
  • Attach the back end of the p-trap (the horizontal end) to the drain pipe outlet in the sink cabinet. Normally, a 1 1/2 inch to 2 inch bushing connector is already installed. The p-trap slides inside, the lock nut on the pipe is tightened to secure it. If not, install one on the main drain pipe before connecting the p-trap.
  • Let the plumber’s putty dry for 24 hours if putty was used. Turn on faucet and look for leaks. If you find leaks, turn off the faucet, and tighten the lock nuts where leaks occur. Use silicone to prevent other small leaks in pipe fixtures.

Tips: Always use a metal drain pipe, and avoid using those cheap plastic drain pipes manufacturers include with their sinks. These pipes are weak (very cheaply made) and will not form a water tight seal with your p-trap.

Install Bath Sink Drain

Install Bath Sink Drain

Are you ready now for installing bathroom sink drain on your own?