Skip to Content

Bathroom Sink Drain Pipe And P-Trap Don’t Meet [3 Reasons and Fixes]

Failed to meet the bathroom sink drain and P-trap? After a hardworking session towards installation, this state surely wouldn’t delight anyone, would it? 

Worry not, I have sorted some ideal fixings along with the reasons to discuss! Before getting too late, let’s take you through this in-depth discussion.

Then, why do the bathroom sink drain pipe and P-trap don’t meet?

Without proper size measurements of P-traps and bathroom sink drain pipes, this incident might occur. If you get the drainage system far from P-traps, getting into trouble is a must. Meanwhile, an inappropriate installation process of these materials can make your hardship go in vain.

Still, I have left many things to discuss deeper. In this article, you will get the key reasons behind the joining issue of these.

Let’s dive in deeper then!

Reasons Behind P-Trap Installation Drain Doesn’t Line Up Bathroom Sink Pipe

Several reasons are there that result in wrong alignments of sink pipes and P-traps. That’s why knowing them all clearly is a must before installing. 

By the end of this section, you will get everything for a proper bathroom settlement. Let’s find out the reasons to keep your DIY bathroom plumbing easier. 

Reason 1: Inaccurate Sizing of Drain Pipe And P-Trap

You might have already understood that these two materials require a perfect match. If you fail to have the correct size of any of these, installation becomes harder and pathetic. 

Mostly, users go quite ignorant of this issue. What they often explore is the pipe stability or strength, etc.

Here I recommend the best P-traps available in the market:

Product 1
Product 2

P-trap comes with a unique mechanism to store water. As a result, it prevents the spread of sewer gas. It makes your bathroom tolerable along with your home too. 

Most users count this work by their previously-done measurements. But the new setup of the bathroom sink requires the newest measurements at. 

Along with that, it’s ideal to keep the distance of 24 inches maximum between these pipes. And the sinkhole diameter must suit the drain pipe diameter correctly.

Reason 2: If P-Trap Locating Far From Drainage Spaces

It’s ideal not to install the bathroom sink far from the drainage system. Mostly, DIY users can not relate if the drainage system has an impact here or not. 

Such ignorance keeps the installation process harder to complete. As a result, you can not join the P-trap and drain pipe properly.

This issue highly occurs in older bathrooms. Putting the drainage system by plumbers at such a distance makes the task harder. 

Meanwhile, you might relate some consequences to this issue. Increased distance ongoing might foster the possibility of a leaky P-trap. 

You can easily guess why this connection with the drain sink won’t be very pleasant, right? 

In the meantime, you might find the bathroom sink drain starting to leak around threads. And, this leak continues to the P-trap connecting point. It might cause your recently installed Hardiebacker board to be damaged too. 

How much distance in maximum does the trick then? 

I already know the maximum distance between the P-trap and the sink drain, right? It should be 24 inches or less. 

Relevantly, I know a trap arm connected with the system. It’s better to have 0.25 inches slope of the trap arm for a 1-foot distance.

Reason 3: Inappropriate Installation of the Sink Drain Pipe And P-Trap

There is a high chance that DIY users might install this in the wrong direction. Imperfection comes with the wrong assembling that you have to focus on. 

Along with that, the wrong alignment can result in hard-tasking to recover. Sink drain and P-trap failing to meet also happen due to this. As a result, you might face water flowing abruptly on the floor. 

Basically, putting P-traps at an improper height from the sink drain is the main curse. As a DIY plumber, measuring the P-trap height is the first task. 

Focus on it as much as you can! Similar to the standard shower valve height, this measurement of the sink drain is quite vital.

As P-traps store some water on their p shape, buying a flexible pipe won’t help. Also, a lack of ventilation related to the pipe can make your task harder. By getting confirmed all of these, you can expect a better installation indeed. 

You might ask if the P-trap can be settled higher than the drain pipe, right? 

Keeping it higher might create some trouble. Such creating barriers in natural water flow are crucial. 

Higher P-traps will ask for more water to have a proper flow. In the meantime, keeping the flow of water is totally natural. 

That’s why it’s suggested to keep the P-trap lower than drain pipes. As a result, higher P-traps can affect drainage systems drastically. Keep ensuring not placing the P-trap just underneath the central exit drain is vital. 

Otherwise, you will find a slower and erroneous drainage system ongoing. Interestingly, another P-trap might get created as a consequence which is undue.

How To Fix While P-Trap And Sink Drain Pipe Don’t Meet

It’s quite frustrating to find these pipes unable to meet properly. And, no DIY plumber would like to face this issue. Fixing as soon as possible is the only gateway. 

Meanwhile, ensuring an appropriate drainage system conducting through the sink drain is vital. Overall, doing things stepwise will push you to reach the final recovery. 

In the meantime, fixing misaligned things correctly might take only a few minutes. That’s the only good news you should remember! 

Meanwhile, you will not require any high-end plumbing mastery either. But things you can carry: 

  • A flexible pipe wrench
  • An adjustable drain pipe

And, here you go!

Step 1: Removing and Inspecting the P-Trap

Mostly, pipes not meeting cases come with the wrong size selection of P-traps. Removing the wrong one initially should be the first approach. 

Then, start inspecting the correct size. Before that, you should explore how to choose and install P-traps indeed. This inspection might require removing the P-trap’s collar. 

Generally, this collar sticks to the wrench requiring removal. Lastly, by going to a plumbing store, you will get an idea of ideal sizes. That’s how the reinstalling process should go on.

Step 2: Re-adjusting Drain Sink Pipes and P-Traps 

Let’s say, you got everything right about the sizing of these. Then, the installation process might need your concentration. 

As misalignment impacts much inside the improper installation, you need to readjust these materials. The repositioning or adjusting can be vertical or horizontal- both. In the middle of the process, you might find the pipe lengthy. 

For that, cutting the pipe and then re-installation is the best approach. Once the height and length get adjusted, you can seal the P-trap collar. 

Step 3: Utilizing Flexible Drain Pipes

As the drain pipe should meet the P-trap, flexibility in joining is required. Meanwhile, you can not expect to have a flexible P-trap because of its unique mechanism. Comparing between P-trap and S-trap also highlights the unique parts of P-traps.

But why not have a drain pipe? That’s where I suggest you have an elastic and adjustable drain pipe. 

This nature will boost drain pipes to get right with the P-trap and drain sink. You might follow the instruction guide coming with the drain pipe kit.


Is a flexible P-trap suitable for work?

Coming in the shape ‘P’, this trap usually keeps stitcher gas out of the house. While utilizing a flexible P-trap, it might end up operating in the wrong manner. As the shape is modifiable, it might stand in misshape while bumping the pipe. Also, there is a chance of flinching leakage somehow.

What are the minimum and maximum distances between a P-trap and a sink?

There is no specific distance as a minimum limit. Meanwhile, the International Residential Code and Residential Edition of the Florida Building Code suggests a maximum distance limit. 24 inches is the maximum of P-traps positioning below sinks. This measurement comes from the fixture outlet to the trap weir.

What length of PVC pipes suit bathroom sink drains?

A size range of around 1.5 inches is used to seize water. It will prevent flowing water out of the sink, and bathroom tub. Meanwhile, a two-inch pipe is generally used in order to drain shower cubicles or washing machines. You can utilize this size range as a vertical accumulation for kitchen sinks.

Final Words

These are the reasons behind the bathroom sink drain pipe and P-trap not meeting

Meanwhile, fixing this won’t catch you in trouble anymore as I spelled out already. Hopefully, issues like this won’t be arising from the next time. 

Still, left something to share? Share with me!

Happy DIY!