PEX Pipes: Everything You Need to Know

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Pex Barrier Pipe

When it comes to plumbing, choosing the right piping material is crucial for the success and longevity of your system. One popular option that has gained significant traction is PEX piping, which stands for cross-linked polyethylene. PEX pipes have revolutionized the plumbing industry due to their affordability, ease of installation, and flexibility. In this comprehensive guide, we will explore everything you need to know about PEX pipes, from their benefits and applications to installation methods and maintenance.

What are PEX Pipes?

PEX pipes are a type of plastic piping that offers numerous advantages over traditional materials such as copper. These pipes are made from cross-linked polyethylene, a durable and flexible material that can withstand high temperatures and pressures. PEX pipes are available in various sizes and lengths, making them suitable for both residential and commercial plumbing projects. Their affordability and ease of installation have made them a preferred choice for many plumbers and homeowners.

Benefits of PEX Pipes

Cost-Effective Alternative to Copper

One of the significant advantages of PEX pipes is their cost-effectiveness compared to copper pipes. PEX piping is significantly cheaper, with costs averaging less than half the price of copper. This affordability extends beyond the pipes themselves, as PEX fittings are also cheaper and easier to install than their copper counterparts.

Faster and Easier Installation

PEX pipes are incredibly flexible, which makes them easier to work with during installation. Unlike rigid copper pipes, PEX pipes have a “memory” and can spring back to their original shape. This flexibility allows for easier maneuverability and reduces the need for complex and time-consuming fittings. Additionally, PEX pipes can be installed using simple connection methods, such as crimp rings or cinch clamps, which are more affordable and practical for DIY projects.

Resistance to Corrosion

Unlike copper pipes, which can corrode over time, PEX pipes are resistant to corrosion. This makes them an excellent choice for areas with acidic water, as they will not deteriorate or develop leaks. PEX pipes also have excellent resistance to chemicals, making them suitable for a wide range of plumbing applications.

Versatility and Adaptability

PEX pipes are highly versatile and can be used for both hot and cold water supply systems. They are suitable for various plumbing applications, including potable water distribution, radiant floor heating, and even underground installations. PEX pipes can easily adapt to existing plumbing systems, allowing for hassle-free retrofitting and remodeling projects.

PEX Pipes vs. Copper Pipes

When comparing PEX pipes to traditional copper pipes, several factors come into play. Let’s explore the key differences between these two materials.

FeaturePEX PipesCopper Pipes
CostLess expensiveMore expensive
InstallationFaster and easierMore time-consuming
Corrosion resistanceHighly resistantProne to corrosion
FlexibilityHighly flexibleRigid
Health and safetySafe for drinking waterMay leach copper into water

While copper pipes have been a staple in plumbing for many years, PEX pipes offer significant advantages in terms of cost, installation, and resistance to corrosion. However, it’s essential to consider local plumbing codes and regulations when choosing between PEX and copper pipes for your specific project.

PEX Pipes and CPVC

Another common comparison is between PEX pipes and CPVC (chlorinated polyvinyl chloride) pipes. Here’s a closer look at the differences:

FeaturePEX PipesCPVC Pipes
InstallationEasier and fasterRequires glue and ventilation
Freeze resistanceLess likely to burstMore susceptible to bursting
FlexibilityHighly flexibleLess flexible
RemodelingSuitable for fishing through wallsLess suitable for remodeling

While both PEX and CPVC pipes have their advantages, PEX pipes are often preferred due to their ease of installation, freeze resistance, and flexibility. However, specific project requirements and local codes should be taken into account when making a decision.

Tools and Installation Methods

To successfully work with PEX pipes, you’ll need a few essential tools and familiarize yourself with the right installation methods.

Tools for PEX Installation

  • PEX cutter: A scissors-like cutter designed specifically for cutting PEX tubing.
  • Crimping tool: Used for crimping metal rings over the fittings.
  • Cinch clamp tool: Used for tightening cinch clamps around the fittings.
  • Manifold: A central distribution point for PEX supply lines in a home-run system.

PEX Installation Methods

Crimp Rings

Crimp rings are metal bands that are slipped over the fittings and compressed using a crimping tool. This method requires separate crimping tools for different sizes of fittings or a universal tool with a swappable insert.

Cinch Clamps

Cinch clamps work similarly to traditional band clamps. The cinch clamp tool is used to tighten the clamp around the fitting. One advantage of cinch clamps is that the same tool can be used for all sizes of cinch clamps.

Manifold System

A manifold system involves installing a central manifold from which individual PEX supply lines are run to each fixture. This system minimizes the number of fittings required and simplifies plumbing runs. It is particularly suitable for new construction or extensive remodeling projects.

It’s important to note that local plumbing codes may dictate specific requirements for PEX installation. Always consult with a professional or local plumbing inspector to ensure compliance with regulations.

Splicing PEX Fittings

When it comes to connecting PEX fittings to existing pipes or fixtures, several methods can be used.

Stab-In Tee

The stab-in tee is a simple and efficient method of connecting PEX fittings to existing plumbing. This method involves cutting out a section of the existing pipe and inserting the stab-in tee fitting. Stab-in fittings, such as those from SharkBite, do not require soldering and can save time during installation. However, it is important to check local plumbing codes to ensure the use of stab-in fittings is allowed.

Soldering and Adapter

Another method involves soldering a tee and a PEX supply adapter to an existing pipe. The PEX supply tubing is then attached to the adapter using the chosen connection method. This method is commonly used when connecting PEX fittings to copper pipes.

Using Manifolds

Manifolds are particularly suitable for PEX installations using a home-run system. Instead of running individual supply lines to each fixture, a manifold is installed near the main water line and water heater. From the manifold, separate PEX lines are run to each fixture. This system reduces the number of connections required and simplifies plumbing runs.

Consult local plumbing codes and regulations to ensure the chosen splicing method is compliant with the specific requirements of your area.

Code Compliance and Safety

Before undertaking any plumbing project involving PEX pipes, it is crucial to understand and comply with local plumbing codes. Plumbing codes can vary significantly between regions, and adherence to these codes ensures the safety and functionality of your plumbing system.

It is also essential to use PEX piping and fittings that comply with industry standards and certifications. Look for products that are tested and approved by reputable organizations such as NSF (National Sanitation Foundation) and IAPMO (International Association of Plumbing and Mechanical Officials). These certifications confirm that the products meet the necessary health and safety standards for use in potable water systems.

Maintenance and Lifespan

PEX pipes are known for their durability and longevity. When installed correctly and within their pressure and temperature ratings, PEX pipes have a predicted lifespan of up to 50 years. However, proper maintenance is still essential to ensure optimal performance and longevity.

Routine maintenance for PEX pipes includes regular inspections for leaks, proper insulation in cold climates to prevent freezing, and addressing any plumbing issues promptly. It is also advisable to consult with a professional plumber for periodic system checks and maintenance.


PEX pipes have revolutionized the plumbing industry, offering numerous benefits over traditional materials like copper. Their affordability, ease of installation, and resistance to corrosion have made them a preferred choice for both professionals and DIY enthusiasts. By understanding the advantages, installation methods, and code compliance considerations, you can confidently incorporate PEX pipes into your plumbing projects, ensuring a reliable and efficient system for years to come.

Remember to consult with professionals and adhere to local plumbing codes to ensure a successful and safe installation. With TUBOMART’s reliable PEX pipes and fittings, you can trust in the quality and performance of your plumbing system.

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