How to Connect PEX to PVC


The flexibility of PEX is literally outstanding. It eases the process of attaching the water supply lines that run throughout the entire house. With the advantages of that, you can save some plumbing costs. Whenever you need to replace a portion of your old PVC pipe, you can simply install a PEX to connect the portion properly.

How to Connect PEX to PVC

However, the sizing standards of the PEX and PVC sometimes a bit different as they don’t refer to the same sizing standards. So, before you dive in to complete the job yourself, you have to know how to connect PEX to PVC. Let’s show you the exact way of attaching the PEX with PVC pipes.

Required Materials:

  • PEX Pipe,
  • PVC Pipe

The Length of the PEX pipe must be shorter than the length of the PVC Pipe by approximately one foot. This will allow for a connection to the house’s plumbing system and provide additional padding against freezing in cold weather.

  • Glue –

There are many types on this market, so make sure you know which type is appropriate for your specific project before purchasing! For example: If pipes may get wet or if there might be pressure issues, then use glue that can withstand those conditions, such as PVC cement or polyurethane adhesive

However, if only regular household temperatures apply, then any general-purpose glue should suffice.

Methods on How To Connect PEX To PVC

Method One

Step One:

Cut two lengths of PEX tubing to the desired length. Measure and cut one end at an angle. This is where you will put in your connectors for easy connection later on.

Cut Two Lengths of Pex Tubing

You may want to leave a little extra length above your connector so that you can see which side they would go if it gets difficult to tell when connecting them together later on. Don’t worry about cutting both ends at angles just yet – we’ll get back to that soon enough.

Step Two:

Slide Teflon tape over the threads of each tube’s male adapter fitting (the threaded part). Thread these fittings into each other until they are tight to ensure they won’t come back out when you are trying to connect them later on.

Step Three:

Put the PEX tubing with threaded ends together and slide the Teflon tape onto both of those threads as well, making sure that it is snugged up all around, so there isn’t any air leakage along the joint.

Now take your other length of PEX tubing (the one without threaded fittings) and cut off a small piece at an angle – this will be where we put our connectors in to join these two lengths together later on.

Step Four:

Slide some more Teflon tape over each thread and push your connector pieces into place on either side for easy connection down the line. When connecting them together, make sure you take care not to cross the threads and that they’re threading nicely.

Step Five:

Now join these two lengths of PEX together by slipping each connector piece into place on either side, making sure they are lined up with one another, so no air is leaking out at the joint.

Join These Pex to Pvc

Here’s where it starts getting tricky – now we need to use a coupling ring that will help us attach both of our connectors (or couplings) together in order for them to create an airtight connection without any leaks or seepage along the way.

The last step would be connecting this final length back downline from your main water line coming straight out of your city water tap, branching off towards different sections of your building as needed.

Method two

Step 1

First of all, you have to remove the damaged portion of the PVC pipe. Simply cut it out with a hacksaw. Slide the rounded side and continue the process until you remove it completely.

Step 2

Now, apply a thick coat of PVC primer on the surface where you have just cut the portion out. Make sure to coat each end with PVC glue and then slide the pieces into the fitting. Hold them together for 40 seconds, at least.

Step 3

Next, wrap a pipe sealant tape around the PVC fitting. Make sure to cover the entire surface with tape.

Step 4

After that, take the female threaded brass, set it into the PEX adapter, and the male threads into the PVC fitting. Now twist the fitting by your hand and make sure to tighten them clockwise. If needed, use an adjustable wrench and secure both ends properly.

Step 5

Roll over an end of a PEX tubing with a crimped loop. Move the tube end to the edge of the brass fitting mounted. That’s it, you have made it.


You can’t go wrong with this easy DIY project. All you need is a few basic tools and supplies, including PEX pipe, PVC pipe, wire cutters or pliers, Teflon tape (optional), steel wool (optional), and an adjustable wrench. We hope we’ve given you the confidence to tackle your own plumbing projects!

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