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How to Replace A Sink Drain P Trap

Need to replace a sink drain P-Trap in your house? This is a step-by-step guide to replacing a P-Trap. We have the full guide to everything you need to know about changing your p Trap.

What is a sink p-trap?

A p-trap or also known as a sink drain trap is located under the sink. It is the section of the drain pipe that bends and is curved. This is where it gets its name from as the bend looks like the letter P.

It connects the sink drain to the main drain pipe on the wall. Its function is to effectively drain the water.

Replace P Trap

The P-trap is important as it keeps a small amount of water at the bottom of the trap and this works as a seal to eliminate sewer gases from seeping out of the sink. It can be made from copper, PVC, brass or chrome.

The components of a p-trap are connected with slip fittings that are easy to assemble and take apart.

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You may need to disassemble a p-trap if you are experiencing a clog in your sink that is affecting your pipe.

Parts of a Drain P-Trap

Your sink trap comes in two parts. These are called the trap bend and the waste arm.

Trap Bend- This component is shaped like a 'U'. One end is connected to the trap arm and the other end is connected to the tailpiece.

Waste Arm- This is also known as a trap arm or S-Bend. It is connected to the trap bend and the main drain on the other end.

Tools and Equipment Needed

To replace P-Trap, a kit is needed which can be purchased from any large homemaker and hardware store. Make sure that all parts in the kit match your current trap diameters and configurations. If you have a double sink, for instance, ensure that you have purchased a kit that is ideal for a double kitchen sink.

You should have these tools and equipment readily available.

  • Slip-joint type of pliers
  • Bucket
  • P-Trap kit
  • PVC cutter or hacksaw

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How do you replace a P trap under a sink?


Step 1

Take your bucket and place it directly under the trap to catch any water spillage. Next, you will use your pliers to loosen the nuts that hold the trap bend.

Slide off the bend. If you are having some trouble, slightly wiggle it off until you have removed it.

You will then remove the nut that is holding the trap arm in place. Simply slide off the trap arm from the opening of the drain. Keep all parts aside.

Step 2

Take your new trap kit and layout all the parts. You will be sliding the new slip nut over the trap arm, the end with the curve. On the straight end of the arm, place the other slip nut. Making sure the open threads of the buts are facing outwards.

The next step is to slide the straight end of the trap arm into the drain opening. A tip is to ensure it fits correctly. Allow for space so that the trap arm can slide inward and outward of the drainage opening.

Slide the nut over the threaded ending of the drain opening. Keep some room available in case you need to make some adjustments.

Step 3

Slide the nut over the tailpiece that is over the sink drain. Place the washer on top. The bevelled edge should be facing down. The next step is to slide the drain trap bend over the tailpiece. You need to position the bend so that the opposite end takes in the curved part of the arm trap.

Make the necessary adjustments and tighten the slip nuts on the tailpiece and the trap bend.

If the arm is longer, you can cut to size using your hacksaw or PVC cutter. Check your p-trap kit for different trap arm sizes already available.

Step 4

Once you have completed these steps and all of the fittings are in place. Start by tightening the slip nuts using your hand, give another turn using your pliers. Do not over tighten as doing so can crack or burst your pipe or damage any nuts and bolts. It can also make it difficult to remove if you need to later on.

Your last process should be testing and checking for any leaks. Open your bathroom sink taps and let the water freely run. Inspect all fittings around the sink. If you notice a leak or any drips, you may need to adjust or tighten the nuts or bolts.

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