How To Connect Pipes Under Bathroom Sink

Connecting pipes under your bathroom sink can seem overwhelming, but it's a manageable task when broken down into simple steps. Whether you need to install a new sink, replace old pipes, or fix a leak, this guide will provide you with the essential steps to successfully connect pipes under your bathroom sink.

Tools and Materials Required

Adjustable wrench
Pliers
Pipe cutter
Teflon tape
Pipe dope (optional)
Utility knife
Plumber's putty

Safety First

Before starting any plumbing work, it's crucial to ensure safety. Wear appropriate safety gloves and eye protection. Turn off the water supply to the sink by closing the shut-off valve underneath the sink or the main water supply. Open the faucet to release any remaining water.

Step 1: Remove the Old Pipes

If you're replacing old pipes, carefully disconnect them using an adjustable wrench or pliers. Be mindful of the direction of the threads to avoid cross-threading when removing the pipes.

Step 2: Prepare the New Pipes

Cut the new pipes to the desired lengths using a pipe cutter. Apply Teflon tape or pipe dope to the male threads of the new pipes. This will help create a watertight seal when connecting them.

Step 3: Connect the P-Trap

The P-trap is the curved pipe underneath the sink that prevents sewer gases from escaping into your bathroom. Insert the P-trap into the drain hole and hand-tighten the nuts. Use an adjustable wrench to further tighten them, but avoid overtightening.

Step 4: Connect the Faucet Supply Lines

Attach the faucet supply lines to the hot and cold water valves under the sink. Hand-tighten the nuts, then use an adjustable wrench to securely tighten them.

Step 5: Connect the Drain Pipe

Insert the drain pipe into the P-trap and secure it using a slip nut. Hand-tighten the nut and use pliers to further tighten it.

Step 6: Install the Sink Drain

Apply a bead of plumber's putty around the rim of the sink drain. Insert the drain into the sink hole and hand-tighten the nut. Use an adjustable wrench to tighten the nut securely, again avoiding overtightening.

Step 7: Turn on the Water Supply

Slowly open the shut-off valve to gradually restore water flow to the sink. Check all the connections for leaks. If you notice any leaks, tighten the connections slightly and recheck.

Conclusion

Congratulations! You have successfully connected the pipes under your bathroom sink. By following these steps carefully and ensuring proper safety precautions, you have completed this plumbing task with confidence.