Connecting PEX to copper pipes is a fundamental skill in modern plumbing, whether upgrading old systems or integrating new fixtures. PEX is prized for its flexibility, freeze resistance, and cost-effectiveness, while copper remains valued for its longevity, heat tolerance, and reliability in pressurized applications.
So, what’s the most secure and efficient way to join these different materials? This article examines four proven connection methods and introduces professional tools from SUMA to help you achieve leak-free, durable PEX-to-copper connections.
1. Versatile Installation Methods for Diverse Plumbing Requirements
Multiple PEX-to-copper connection techniques—including crimping, Clamp, push-to-connect, and expansion systems—deliver adaptable solutions for a wide range of installation conditions and project demands.
2. Four Primary Ways To Connect PEX And Copper Pipes
2.1 Crimp Connection – Cost-Effective and Reliable
Crimp connections utilize copper crimp rings and a specialized crimping tool to compress the ring around PEX tubing and a transition fitting, creating a secure mechanical seal. This method is widely adopted for its balance of affordability and long-term performance.
Pros
Cost-effective solution with readily available components
Provides strong, durable connections suitable for long-term applications
Compatible with most PEX-B and PEX-C piping systems
Cons
Requires specific crimping tools for installation
Connections are permanent and must be cut for disassembly
Proper calibration of crimping tools is essential for leak-free performance
2.2 Clamp Connection – Reliable and Visually Verifiable
Clamp connections utilize stainless steel clamps and a specialized clamping tool to create a secure, 360-degree compression seal around PEX tubing and transition fittings. This method is widely recognized for its reliability and ease of visual inspection.
Pros
Strong and reliable sealing performance, resistant to vibration and pressure fluctuations
Visual verification: the clamp’s observation window allows installers to confirm proper compression
reusable clamping tool, suitable for high‑frequency installation scenarios
Cons
Slightly higher cost compared to copper crimp rings
Requires a specific clamping tool, which may not be interchangeable between brands
Not reusable once installed; requires cutting for disassembly
2.3 Push-To-Connect – The Fastest And Easiest Option For DIY Installations
Push-to-Connect fittings (e.g., SharkBite-style designs) enable direct connection of PEX and copper pipes without specialized tools. The fittings employ internal O-rings and gripping teeth to secure the pipe, allowing for quick installation and disassembly.
Pros
No specialized tools required; ideal for quick repairs and DIY projects
Removable and reusable, facilitating modifications and emergency fixes
Compatible with multiple pipe types (PEX, copper, CPVC)
Cons
Higher cost per fitting compared to crimp or clamp methods
Potential for minor leaks under high-pressure or high-temperature conditions
Bulkier fitting design may require additional space in tight installations
2.4 Expansion Connection – The Most Secure Seal For PEX-A Systems
Expansion connections involve temporarily expanding the end of PEX-A tubing using an expansion tool, inserting a specially designed fitting, and allowing the tube to contract naturally to form a strong, durable seal. This method is exclusive to PEX-A due to its shape-memory properties.
Pros
Full flow diameter: no internal obstruction, minimizing pressure loss
Exceptional resistance to leaks and pull-out forces
Ideal for cold climates and high-pressure applications
Cons
Only compatible with PEX-A tubing
Requires an expensive expansion tool, raising initial investment costs
Additional waiting time for the pipe to fully contract before pressure testing
3. Choosing The Best PEX-To-Copper Connection Method
For affordability and durability: Choose Crimp/Clamp
For quick, tool-free installation: Choose Push-to-Connect
For the most secure, high-flow connection: Choose Expansion
Conclusion: Selecting The Right PEX-To-Copper Solution
The optimal connection method depends on your specific needs:
Crimp and Clamp methods offer cost-effectiveness and proven reliability for most residential applications.
Push-to-Connect fittings provide unmatched convenience for temporary or urgent repairs.
Expansion connections deliver superior performance and are ideal for demanding environments and high-flow systems.
