Straighten PEX tubing by applying controlled heat or using mechanical roller tools to counteract the material's natural coil memory.

To straighten PEX, apply gentle heat to the tubing until it becomes pliable, then manually stretch it straight or secure it against a flat surface. You can also use mechanical straightening devices with internal rollers for faster results. Always allow the pipe to cool completely in a straight position to ensure it retains its new shape.

Safety Precautions and Preparation

Before beginning, inspect the PEX for deep scratches or gouges. Wear insulated gloves when handling heated pipes to prevent skin burns. Never use an open flame, such as a torch, as this can damage the chemical structure of the cross-linked polyethylene. Ensure you have a flat workspace long enough to accommodate the section of pipe you are straightening.

Primary Straightening Methods

• Heat Gun Application: Pass a heat gun back and forth over the curved section. Constant movement is required to avoid melting the exterior of the pipe.
• Mechanical Straighteners: These specialized tools feature several rollers. As you pull the PEX through the device, the rollers apply consistent pressure to remove the coil.
• Ambient Temperature: Laying the pipe out in a warm environment or under direct sunlight helps the material relax naturally over several hours.

Comparison of Straightening Methods

Step-by-Step Thermal Straightening

1. Uncoil the PEX and identify the direction of the natural curve.
2. Turn the heat gun to a low or medium setting to avoid overheating.
3. Apply heat while rotating the pipe to ensure even distribution across the entire surface.
4. Once the pipe feels soft and flexible, pull it straight or clamp it against a straight board.
5. Maintain the straight position for at least three minutes until the material cools and hardens.