Installing Drain Pipe Under Bathroom Sink

Installing Drain Pipe Under Bathroom Sink: Essential Aspects

Installing a drain pipe under a bathroom sink is a crucial plumbing task that ensures proper drainage and prevents clogs and leaks. Understanding the essential aspects of this process is vital for a successful installation.

1. Tools and Materials

Before starting, gather the necessary tools and materials, including a sink drain kit, pipe wrench, adjustable wrench, plumber's putty, tape measure, and cleaning agent.

2. Disconnecting the Old Drain

First, turn off the water supply valves beneath the sink. Use an adjustable wrench to loosen the nuts connecting the old drain pipe to the sink and trap. Carefully detach the pipe and discard it.

3. Preparing the Sink Hole

Clean the sink drain hole thoroughly with a cleaning agent to remove any debris or old putty. Apply a thin bead of plumber's putty around the sink hole's inner rim. This will help seal the drain assembly.

4. Installing the Drain Assembly

Insert the drain assembly into the sink hole. Use a washer and nut to secure it, tightening it with a wrench. Avoid overtightening to prevent damage.

5. Connecting the P-Trap

Attach the P-trap (the U-shaped pipe) to the drain assembly. Hand-tighten the nuts first, then use a pipe wrench to further secure the connection. Ensure the P-trap slopes slightly downward towards the wall drain.

6. Connecting to the Wall Drain

Insert one end of the flexible corrugated drain pipe into the P-trap outlet and the other end into the wall drain. Secure both connections with hose clamps.

7. Testing and Final Adjustments

Turn on the water supply and check for leaks around the drain connections. If any leaks occur, tighten the nuts or replace the putty as necessary. Adjust the drain assembly's position if it doesn't drain properly.