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How To Remove Compression Fitting From Plastic Tubing [Details Explained!]

Removing a compression fitting falls onto basic plumbing works. But we see them attached to copper tubing most of the time. What about plastic tubing?

How to remove compression fitting from plastic tubing?

To remove the compression fitting from plastic tubing you’ll need two crescent wrench. Place one on the fitting body and another on the metal nut. Twist it counterclockwise until it comes off. Pull out the tubing from compression fitting. Use a needle nose plier to pull out the brass insert.

Need a detailed explanation? I’ve got your back. Read my piece to get the step-by-step process of removing a compression fitting from plastic tubing.

Let me begin!

Knowing The Compression Fitting

Removing a compression fitting from a tube isn’t so hard. In fact, anyone can do it on their own. But you’d need at least some level of basic plumbing knowledge for this. 

More importantly, first, you’d need to know the basics of a compression fitting. Compression fittings are the most common tool to connect metal or PVC tubings. It’s usually made out of brass.  

Compression fittings are used for plumbing and gas line work. This is due to its capability of withholding extreme temperature and pressure. It’s compatible with the flow of aggressive fluid or gas. It can be used on both plastic and metal tubings. 

Plastic tubing with compression fitting is hardly used for gas lines. But it’s used for plumbing work. A set of compression fitting comes with a few tools. 

It has a female-threaded nut, male-threaded brass fitting, brass insert, and a plastic ring. The terms male and female threaded are unknown to many. 

You’d need some prior knowledge regarding FPT in plumbing to understand these terms.

Removal Process Of Compression Fitting From Plastic Tubing

Removing a compression fitting from a plastic tube comes with a few steps. You need to follow them carefully. For your ease, I have made a step-by-step guideline for it. 

So, let’s go through them one by one!

Step-1: Shut Off Water Supply

Compression fittings usually come with a shut-off valve at one end. It can be connected to the wall. Firstly you’d need to shut off the water supply. 

After that, twist the handle of the shut-off valve to open it. Be careful with putting pressure on it to not break the valve handle. Now, let the remaining water drain from the line.

Step-2: Removing The Metal Nut

After opening the shut-off valve you’ll see the male threaded part. It is called the brass fitting. A metal nut should be connected on the other side of it.

The end side of the plastic tubing is located inside the brass fitting. To open the brass fitting, you’d have to remove the nut. To do it you’d need two crescent wrench.

Now, take a crescent wrench and place it on the compression fitting’s body. Use the other one to twist the nut from the compression fitting. Twist it counterclockwise until it comes loose. 

Sometimes these metal parts become rusty. So it becomes extra hard to remove these parts. Use an emery cloth to scrub the rusted part. It’ll help with removing the nut.

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Clean these parts with an abrasive cleaner once you take them out. It’ll help with the rust problem.

Step-3: Removing The Compression Fitting Body

The brass fitting is inserted inside the plastic tubing. And the plastic tubing is inserted inside the brass fitting. You’d have to pull the brass fitting so that the plastic tubing comes out.

Hold one side of your plastic tubing and pull the brass fitting’s body. If needed use pliers or wrench for assistance. If it doesn’t come out then cutting the pipe might be the only option.

If you need to cut the pipe, keep at least a 3-4 cm gap. The gap should be measured from the compression body. Use a pipe cutter to cut the pipe. You can also use the same type of dremel that cuts ductwork.

If the tubing comes out of the brass fitting it gets easier. That way you won’t have to shorten the pipe size.

Step-4: Removing The Brass Insert

Once the fitting body comes off you’ll see a plastic ring on the tube. Pull out the ring. Now, removing the inserted brass would be a bit tricky. 

Because the brass insert is attached inside the tube. So, you can’t directly pull it out. You’ll be needing a needle nose plier to do the job. 

Hold the plastic tube with one hand. Now use the needle nose plier to bring out the inserted brass. If it doesn’t come out, you’ll have to cut the pipe.

Or you can leave the inserted brass as it is. It’s not really necessary to pull it out. But if you still want to then cutting the pipe is the only way.

Hopefully, now you’ll be able to remove the compression fitting by yourself.


Question: How to stop water leaking from a compression fitting?

Answer: If water is leaking from the fitting then the pipe must be misplaced. Or the fitting isn’t tight enough. First set the tubing properly to the fitting. Then tighten the nuts properly. It should do the work.

Question: Are push-to-connect fittings well to use?

Answer: Push-to-connect fittings are mostly used on pipe joints. It connects copper or metal pipes with plastic pipes. It’s best to use them on CPVC, PEX, and copper pipes.

Question: Are compression fittings reusable?

Answer: It depends on the type of compression fitting. Plastic compression fittings are not reusable. So are some metal compression fittings. Especially those that have a ferrule ring between pipes and the fitting body.

Ending Words

That was all from me about how to remove compression fitting from plastic tubing? Hopefully, now you know how to do it. Easy right? No need to spend money on hiring a plumber for such easy work.  

That’s it for today. I’ll be back with more plumbing solutions for you soon.

Bye till next time!