Can You Use PEX-B Fittings on PEX-A?

Hey, plumbing enthusiasts and DIYers! Have you ever found yourself in a plumbing predicament, wondering if you can mix and match different PEX fittings? The world of plumbing materials can be as complex as a puzzle, especially concerning PEX pipes and fittings. If you’ve come across the terms PEX-A and PEX-B, you might be curious about the compatibility of their fittings. Today, we’re diving deep into PEX pipes and fittings to answer the question: can you use pex b fittings on pex-a.

This article will unravel the intricacies of PEX pipe fittings, explore the PEX A to PEX B transition, and guide you through understanding whether you can use PEX B fittings on PEX A pipe. So, buckle up and prepare for a plumbing adventure that will leave you informed and empowered to make the right choices for your plumbing projects!

Explanation of PEX-A and PEX-B

Before we delve into the compatibility of fittings, let’s understand what PEX-A and PEX-B actually are. PEX-A and PEX-B are two different manufacturing methods of PEX tubing, each with its own set of characteristics.

can you use pex b fittings on pex-a

Differences between PEX-A and PEX-B

PEX-A and PEX-B are both flexible and durable options for plumbing systems, but they are produced using different methods, resulting in distinct characteristics. The key differences between PEX-A and PEX-B:

Feature PEX-A PEX-B
Flexibility Most flexible Less flexible
Coil memory Little or no coil memory Some coil memory
Kink resistance Kink resistant Not kink resistant
Burst pressure Higher burst pressure Lower burst pressure
Temperature rating Higher temperature rating Lower temperature rating
Cost More expensive Less expensive
Joining method Expansion fitting Compression fitting
Applications Preferred for cold climates and applications where flexibility is important Preferred for hot climates and applications where cost is important

Note: PEX-A and PEX-B are not interchangeable. The different joining methods require specific fittings, and the different properties of the materials can affect the plumbing system’s performance.

Expansion-Style Fitting vs. Insert-Style Fitting

One of the major differences between PEX-A and PEX-B lies in the type of fitting used. PEX-A utilizes an expansion method, where the tubing is expanded to allow insert fittings without the need for crimp rings or cinch clamps. On the other hand, PEX-B employs insert-style fittings that require crimp rings or cinch clamps to secure the connections. This difference in fitting styles is crucial in determining whether PEX-B fittings can be used on PEX-A tubing.


PEX-A is renowned for its exceptional flexibility, allowing it to bend more easily and maneuver around obstacles in tight spaces. PEX-B, while still flexible, may not exhibit the same level of bendability as PEX-A. This flexibility factor should be considered when deciding on the compatibility of fittings between these two types of PEX tubing.


PEX-A and PEX-B can be repaired using appropriate methods, but the approach may differ due to their distinct fitting systems. PEX-A’s expansion fittings can be removed more easily, simplifying the repair process. PEX-B’s insert-style fittings may require more effort to disassemble, impacting the ease of repair.

Sizing the System

It’s important to note that PEX-A and PEX-B are available in various sizes, but compatibility with fittings may vary. Manufacturers typically provide guidelines for matching tubing sizes with specific fittings, ensuring a secure and leak-free connection.

Can I Use Pex B Fittings on Pex A Pipe?

The million-dollar question: Can you use PEX-B fittings on PEX-A tubing, or should you strictly stick to fittings designed for the same type of tubing? Let’s explore the considerations and potential scenarios.

Explanation of Why It Might Be Necessary to Use PEX-B Fittings on PEX-A

In some instances, you might find yourself in a situation where using PEX-B fittings on PEX-A tubing becomes a consideration. It could be due to the availability of certain fittings, cost considerations, or specific project requirements. While it’s generally recommended to use fittings designed for the corresponding PEX tubing type, there are scenarios where mixing fittings might be necessary.

Manufacturer Recommendations

Manufacturers of PEX tubing and fittings often provide clear guidelines on compatibility. It’s crucial to consult the manufacturer’s documentation and recommendations before using fittings from one type of PEX tubing on another. Deviating from these recommendations could lead to potential leaks, reduced system performance, and warranty voids.

Contractor Recommendations

Experienced plumbers and contractors bring valuable insights to the table. If you’re unsure about the compatibility of PEX-B fittings on PEX-A tubing, seeking advice from professionals with hands-on experience with different types of PEX systems can provide you with practical guidance and recommendations.

Risks and Benefits of Using PEX-B Fittings on PEX-A

As with any plumbing decision, there are risks and benefits to consider. Using PEX-B fittings on PEX-A tubing could potentially lead to compatibility challenges, connection security, and long-term performance. On the other hand, if done correctly and under specific circumstances, it might offer a temporary solution. However, weighing these risks against the potential benefits is essential before deciding.

How to Connect PEX-A to PEX-B

If you’ve determined that using PEX-B fittings on PEX-A tubing is the right choice for your situation, it’s important to follow the appropriate methods to ensure a reliable connection. Here are two methods to consider:

Recommended Method: PEX-B Insert-Style Fitting with Crimp Rings

  1. Gather Your Tools and Materials: Before you begin, ensure you have the necessary tools and materials, including PEX-B fittings, PEX-A tubing, crimp rings, a crimping tool, and a pipe cutter.
  2. Cut the PEX-A Tubing: Measure and cut the PEX-A tubing to the desired length using a pipe cutter. Ensure the cut is straight and free from debris.
  3. Insert the Fitting: Slide the PEX-B fitting into the end of the PEX-A tubing. Make sure it’s seated securely.
  4. Crimp the Ring: Position the crimp ring over the tubing-fitting connection and use a crimping tool to secure the ring. Follow manufacturer instructions for the appropriate crimping technique.
  5. Check the Connection: Give the connection a gentle tug to ensure it’s secure. Perform a water pressure test to check for leaks.

How to Connect PEX-A to PEX-B

Alternative Method: SharkBite Fitting

  1. Gather Your Tools and Materials: Collect the necessary tools and materials, including SharkBite PEX-B fittings, PEX-A tubing, and a pipe cutter.
  2. Cut the PEX-A Tubing: Measure and cut the PEX-A tubing to the required length using a pipe cutter.
  3. Insert the SharkBite Fitting: Push the SharkBite PEX-B fitting onto the end of the PEX-A tubing until you feel a click.
  4. Check the Connection: Give the connection a firm tug to ensure it’s secure. SharkBite fittings are designed for easy installation without the need for additional tools.

Tips for a Successful Connection

Whether you’re using insert-style fittings with crimp rings or SharkBite fittings, here are some tips to keep in mind:

  • Measure Twice, Cut Once: Accurate measurements are crucial for a proper fit.
  • Deburr the Tubing: Using a deburring tool to remove any sharp edges after cutting.
  • Use Proper Technique: Follow manufacturer instructions for inserting fittings and applying crimp rings.
  • Pressure Test: Always perform a pressure test before closing up walls or concealing the connections.

Tools and Materials Needed

For a seamless connection, gather the following tools and materials:

  • PEX-A tubing
  • PEX-B fittings (insert-style or SharkBite)
  • Crimp rings (if using insert-style fittings)
  • Crimping tool (if using insert-style fittings)
  • Pipe cutter
  • Deburring tool

Common Mistakes to Avoid

As with any plumbing project, there are common mistakes that can lead to suboptimal results:

  • Using the Wrong Fittings: Using fittings not designed for the specific PEX tubing type can result in leaks and system failure.
  • Incorrect Measurements: Accurate measurements are essential to ensure proper fit and alignment.
  • Improper Crimping: Incorrect crimping can lead to insecure connections and leaks.
  • Skipping Pressure Testing: Failing to pressure test can result in undetected leaks and water damage.


The compatibility between PEX-B fittings and PEX-A pipes hinges on several critical factors. Can you use PEX B fittings on PEX-A? While both types fall under the PEX umbrella, they possess distinct characteristics that need careful consideration during any PEX A to PEX B transition. The key lies in understanding their molecular structures and response to pressure and temperature fluctuations. PEX-B fittings, with their slightly different composition, might seem like an option for PEX-A pipes, but this marriage might not always result in a harmonious partnership.

When considering PEX B fittings on PEX-A pipes, weighing the long-term implications is vital. While short-term solutions may present themselves, the true measure of compatibility lies in the durability and reliability of the connection. PEX-A pipes, known for their superior flexibility and expansion capabilities, might not achieve their full potential when paired with PEX-B fittings that might not provide the ideal level of support.


Can you use PEX-A fittings on PEX-B?

Yes, you can use PEX-A fittings on PEX-B tubing, as long as you follow manufacturer guidelines and ensure proper compatibility.

What is the difference between PEX-A and PEX-B tubing?

PEX-A and PEX-B tubing are manufactured using different methods, resulting in distinct characteristics such as flexibility and fitting styles.

Can you use SharkBite fittings with PEX-A or PEX-B?

Yes, SharkBite fittings are designed for compatibility with both PEX-A and PEX-B tubing.

How do you repair a kinked PEX-A or PEX-B pipe?

To repair a kinked PEX-A or PEX-B pipe, cut out the kinked section and use appropriate fittings and techniques to create a secure connection.

What is the lifespan of PEX-A and PEX-B tubing?

Both PEX-A and PEX-B tubing are designed to be durable and long-lasting, with lifespans of around 50 years or more.

How do you choose between PEX-A and PEX-B for a plumbing project?

The choice between PEX-A and PEX-B depends on factors such as budget, project requirements, and manufacturer recommendations.

Can you use PEX-B fittings with PEX-C tubing?

It’s generally recommended to use fittings designed for the specific type of PEX tubing to ensure a reliable connection.

What is the cost difference between PEX-A and PEX-B?

Cost differences between PEX-A and PEX-B can vary, with PEX-B often being more budget-friendly.

How do you transition from PEX-A to PEX-B in a plumbing system?

To transition from PEX-A to PEX-B, follow manufacturer guidelines for connecting the different types of tubing using appropriate fittings.

Are there any safety concerns when using PEX-A or PEX-B?

When installed correctly and following industry standards, both PEX-A and PEX-B are safe options for plumbing systems.

News Reporter

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