How to Install PEX: A Step-by-Step Guide

How To Install Pex

Are you tired of dealing with corroded pipes or leaky plumbing? If so, it might be time to consider installing PEX piping in your home. PEX, or cross-linked polyethylene, is a flexible, long-lasting, and cost-effective alternative to traditional copper or PVC plumbing systems. In this article, we’ll guide you through the process of installing PEX piping in your home, step-by-step.

Tools and Materials

A homeowner cuts and connects PEX pipes in a DIY plumbing project
A homeowner cuts and connects PEX pipes in a DIY plumbing project

Before you begin your PEX installation, you’ll need to gather the necessary tools and materials. Here’s a list of the basic items you’ll need:


  • PEX cutter
  • Crimping tool
  • Scissors or utility knife
  • Tape measure
  • Adjustable wrench
  • PEX bending tool


  • PEX piping (make sure to choose the appropriate size and length for your project)
  • PEX fittings (such as couplings, elbows, tees, and valves)
  • Crimp rings or clamp rings (depending on your chosen connection method)
  • Pipe straps or hangers
  • Teflon tape (for threaded connections)
  • PEX manifold (optional, but recommended for larger installations)

Once you’ve gathered your tools and materials, you’re ready to move on to the next step: preparation.


Before you start installing your PEX piping, it’s essential to prepare your workspace and existing plumbing system. Here are the steps you need to follow:

Shutting off the water supply

The first step in any plumbing installation or repair is to shut off the water supply. Locate your main water shut-off valve (usually located near your water meter) and turn it off. This will prevent water from flowing through your pipes while you work on them.

Draining the water

Next, you’ll need to drain any remaining water from your existing plumbing system. To do this, turn on all the faucets in your home and let them run until the water stops flowing. You may also need to flush your toilets to drain any water from your home’s plumbing.

Removing old pipes

If you’re replacing existing plumbing with PEX piping, you’ll need to remove the old pipes first. Use a pipe cutter or hacksaw to cut the existing pipes to the appropriate length, then remove them from their fittings. Be sure to wear safety goggles and gloves during this process, as it can be messy and dangerous.

Preparation (continued)

Removing old pipes (continued)

Once you’ve removed the old pipes, inspect the area for any damage or corrosion. Replace any damaged or corroded fittings or valves before installing your new PEX piping.

Installing PEX

Now that you’ve prepared your workspace and removed any old plumbing, you’re ready to start installing your PEX piping. Here’s how to do it:

Measuring and cutting PEX pipes

Measure the length of the PEX piping you’ll need for your installation and cut it to size using a PEX cutter or scissors. Be sure to leave enough slack in the pipe to allow for expansion and contraction.

Connecting PEX pipes to fittings

Use a crimping tool or clamp tool to connect your PEX pipes to fittings such as couplings, elbows, and tees. Follow the manufacturer’s instructions carefully to ensure a secure and watertight connection.

Installing valves and connectors

Install valves and connectors where necessary in your PEX piping system. Use Teflon tape to seal threaded connections and make sure all connections are tight and secure.

Installing pipe straps or hangers

Use pipe straps or hangers to secure your PEX piping to walls or ceilings. Make sure to space them evenly and according to local building codes.

Installing a PEX manifold (optional)

If you’re installing a PEX piping system with multiple fixtures, consider using a PEX manifold. This device allows you to control the flow of water to each fixture individually, making it easier to isolate and repair any issues that may arise.

Congratulations! You’ve successfully installed your PEX piping system. But before you turn the water back on, there are a few more steps you need to take to ensure your installation is safe and effective. In the next section, we’ll discuss testing and inspecting your PEX piping system.

Testing and Inspecting

Once you’ve installed your PEX piping, it’s crucial to test the system for leaks and ensure that everything is functioning correctly. Here are the two primary steps you’ll need to follow:

Pressure testing the system

To test your PEX piping for leaks, you’ll need to perform a pressure test. This involves connecting a pressure gauge to your system and pressurizing it to a specific level (usually around 60 psi). Let the system sit for several hours and monitor the pressure gauge to ensure it remains stable. If the pressure drops, you may have a leak in your system.

Inspecting for leaks

After you’ve completed the pressure test, it’s time to inspect your PEX piping for leaks. Check all the connections, fittings, and valves for signs of water or moisture. If you notice any leaks, use a crimping tool or clamp ring to tighten the connection or replace the faulty component.


Proper installation of your PEX piping is crucial to ensure the longevity and performance of your plumbing system. By following the steps outlined in this guide, you can confidently install PEX piping in your home and enjoy the many benefits it offers over traditional piping systems.

PEX piping is flexible, cost-effective, and resistant to corrosion and freezing, making it an ideal choice for modern plumbing installations. With the right tools and materials, you can install PEX piping quickly and easily, even if you have limited plumbing experience.

In conclusion, we hope this guide has been helpful in showing you how to install PEX piping in your home. By following these steps and taking the time to properly test and inspect your system, you can enjoy a reliable and efficient plumbing system for years to come.