PEX (cross-linked polyethylene) tubing has revolutionized modern plumbing with its flexibility and durability. However, the success of any PEX system hinges on the quality and proper installation of its fittings. With various types available, choosing the right one can be confusing. This guide breaks down the most common PEX fittings to help you make an informed decision.
What Are the Different Types of PEX Fittings?
PEX fittings are not a one-size-fits-all solution. The primary types are categorized by their connection method:
Crimp Fittings: This is a widely used and cost-effective method. It involves sliding a copper or stainless steel crimp ring over the PEX tube and using a crimp tool to compress the ring, securing the tube to a barbed fitting.
Press Fittings (Cold Expansion): Often associated with PEX-A tubing, this method uses a press sleeve pre-installed on the fitting. A specialized tool expands the PEX tube and sleeve before inserting the fitting. As the PEX tube shrinks back to its original size, it creates an exceptionally strong and reliable seal.
Cinch (Clamp) Fittings: Similar to crimping, this method uses a stainless steel cinch clamp. A cinch tool tightens a single “ear” on the clamp to create a secure connection. It’s particularly useful in tight spaces where a traditional crimp tool won’t fit.
Push-to-Connect (e.g., SharkBite): These fittings are the easiest to install, requiring no special tools. You simply push the PEX tube into the fitting, and special teeth grip the pipe while an O-ring creates a watertight seal. They are excellent for repairs and transitions between different pipe types.
Is It Better to Crimp or Press PEX Fittings?
The debate between crimping and pressing often comes down to the type of PEX tubing and project requirements:
Crimping is generally more economical and compatible with PEX-B and PEX-C tubing. The tools and fittings are widely available and budget-friendly.
Pressing (Cold Expansion) is considered a premium method, primarily for PEX-A. It creates a connection that is less restrictive to water flow and is often deemed more reliable due to the nature of the PEX-A tubing’s thermal memory. However, the tools are more expensive.
For most DIYers and standard residential projects, crimping is a reliable and sufficient choice. For high-end projects or professionals who value maximum flow and long-term security, pressing is an excellent investment.
Can You Use SharkBite Fittings on PEX?
Absolutely. SharkBite and other push-to-connect fittings are designed for versatility and are fully compatible with PEX tubing (as well as copper and CPVC). Their main advantage is the speed and ease of installation without needing any specialized tools, making them a favorite for quick repairs or in situations where using a large tool is impractical. While they are more expensive per fitting, the convenience often outweighs the cost for smaller jobs.
What Is the Most Reliable PEX Fitting?
Reliability in PEX fittings is closely tied to proper installation. When installed correctly, all major types of PEX fittings—crimp, press, and cinch—are highly reliable and designed to last for decades.
However, many professionals consider the PEX press (cold expansion) system to be the most reliable. This is because the connection relies on the PEX-A tubing’s natural tendency to return to its original shape, creating a powerful, permanent seal that is less dependent on the installer’s tool calibration. The fitting’s internal diameter is also larger than crimp fittings, resulting in better flow and less pressure loss.
Ultimately, the “best” PEX fitting depends on your budget, the type of PEX pipe you are using, and your comfort level with the installation tools. For any method, always follow the manufacturer’s instructions to ensure a leak-free and durable plumbing system.