Which of the following materials CANNOT be used within the building water distribution system

PEX, or cross-linked polyethylene, is a flexible and durable material widely accepted for both hot and cold water supply lines. Its resistance to high temperatures and freeze-thaw cycles makes it an excellent choice for building water distribution systems. PEX is also easy to install and connects seamlessly with other plumbing materials.

CPVC, or chlorinated polyvinyl chloride, is designed for both hot and cold water applications and can withstand higher temperatures than standard PVC. Its chemical stability and resistance to corrosion make it suitable for use in building water distribution systems, particularly where hot water is involved.

Copper is a traditional material used in plumbing due to its durability, corrosion resistance, and ability to handle high temperatures. It is commonly utilized in building water distribution systems for both hot and cold water supply lines, making it a reliable choice in various plumbing applications.