Which material must not be used when making new connections into hot or cold pipework?

Lead must not be used when making new connections into hot or cold pipework due to its toxic properties and associated health risks. Over time, lead can leach into the water supply, posing serious health concerns, especially for young children and pregnant women. The use of lead in plumbing has been prohibited or heavily regulated in many countries to prevent lead poisoning and ensure safe drinking water.

In contrast, plastic, copper, and brass are widely accepted materials for plumbing connections. Plastic is often utilized in plumbing due to its resistance to corrosion and ease of installation. Copper is favored for its durability, antimicrobial properties, and reliability in hot and cold systems. Brass also offers strength and resistance to corrosion, making it suitable for various applications in pipework. Therefore, using lead in plumbing applications is not permissible, ensuring the safety and health of consumers.