How to Put a Bathroom Sink Drain Back Together: A Step-by-Step Guide
Experiencing a clogged or leaky bathroom sink drain can be frustrating, but don't let it get you down. With a little patience and the right tools, you can put your bathroom sink drain back together like a pro. This step-by-step guide will walk you through the process, from disassembly to reassembly, ensuring your sink drain is functioning like new.
Tools You'll Need
- Adjustable wrench
- Plumber's putty
- Plunger
- Screwdriver (flathead or Phillips, depending on your sink's hardware)
- Rubber gloves
- Flashlight
Step 1: Prepare the Work Area
Before you start, lay down a towel or old cloth to protect your countertop from scratches and to catch any debris that may fall out during the process. Also, ensure the area is well-lit to make it easier to see what you're doing.
Step 2: Disassemble the Sink Drain
Start by removing the sink drain cover. If it's held in place by screws, use a screwdriver to remove them. If it's a pop-up drain, you'll need to disconnect the lift rod and the pivot rod from the drain assembly. Once the cover is off, use an adjustable wrench to loosen and remove the large nut that secures the drain tailpiece to the P-trap.

Removing the P-trap
Place a bucket underneath the P-trap to catch any water that may spill out. Use an adjustable wrench to loosen and remove the slip nuts that connect the P-trap to the sink tailpiece and the waste pipe. Once the nuts are loose, carefully remove the P-trap and set it aside.
Step 3: Inspect and Clean the Drain Parts
Now that you have the drain parts removed, inspect them for any signs of damage or wear. If the P-trap is clogged, clean it out using a plunger or a plumber's snake. Once clean, check for any cracks or leaks. If you find any damage, you may need to replace the parts.
Step 4: Reassemble the Drain
Reassembling the drain is essentially the reverse process of disassembling it. Start by applying a small amount of plumber's putty around the threads of the sink tailpiece. This will create a watertight seal once you tighten the nut.

Reinstalling the P-trap
Reinstall the P-trap by first placing it in position and then securing it with the slip nuts. Make sure the slip nuts are tightened by hand, not with a wrench, to avoid cracking the trap.
Securing the Drain Tailpiece
Place the drain tailpiece back into the sink hole and secure it with the large nut. Tighten the nut by hand, using an adjustable wrench if necessary, but be careful not to overtighten it.
Reinstalling the Drain Cover
Reinstall the drain cover by placing it back onto the drain tailpiece and securing it with the screws you removed earlier. If you're reinstalling a pop-up drain, reconnect the lift rod and the pivot rod to the drain assembly.
Step 5: Test the Drain
Pour a few cups of water down the sink drain to test it. The water should drain quickly and without any signs of leaking. If there are any leaks, you may need to adjust the plumber's putty or tighten the nuts and bolts.
Step 6: Clean Up
Once you're satisfied with the performance of your sink drain, clean up the work area. Remove the towel or cloth you laid down earlier and dispose of any debris or old plumber's putty.
That's it! You've successfully put your bathroom sink drain back together. Regular maintenance, such as cleaning the drain regularly and avoiding pouring grease or large food particles down the drain, will help keep your sink drain functioning properly for years to come.