Which pipe material is flexible and easier to install?

• A. Copper
• B. PEX
• C. PVC-U
• D. MDPE

Answer: (B)

Flexibility and ease of installation are the main ideas here. PEX tubing is cross-linked polyethylene, which is highly flexible. You can bend it around corners and run it through walls with far fewer fittings than rigid pipes, so there are fewer joints that could leak and much less labor time. Joining PEX is straightforward with crimp, clamp, or push-fit fittings, and it doesn’t require torches or soldering, making the installation quicker and safer in tight spaces.

Copper is stiff and needs many elbows and soldered joints, which slows things down. PVC-U is rigid and not forgiving for bends, requiring more fittings and space. MDPE is flexible as well, but in many interior plumbing applications it’s used differently and still doesn’t offer the same combination of easy bending and simple fittings that PEX provides for typical cold-water distribution. That combination is what makes PEX the best choice for quick, easy installation.