Which method is approved for jointing new copper pipework to lead pipework?

• A. Compression
• B. Solder
• C. Brazing
• D. Gluing

Answer: (A)

Joining copper to lead pipework using a mechanical compression fitting is preferred because it seals without heating the pipes. This avoids heating the lead, which can cause problems with contamination and pipe integrity, and it provides a secure, watertight joint between different materials. A compression joint uses a nut and olive that compresses between the copper and lead pipes to form the seal, making it a reliable method for mixed-metal connections. Soldering or brazing would require heating near the lead pipe and could introduce lead into the water or leave flux residues, while gluing isn’t a dependable or code-approved method for metal potable-water joints.