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There are different types of plumbing materials used in residential and commercial plumbing systems: 1. Copper: Copper is the most common plumbing material and is used in both residential and commercial applications. It is long-lasting, durable, and resistant to corrosion. However, it is more expensive than other materials and requires skilled labor for installation. 2. PEX: PEX is a flexible plastic tubing that is gaining popularity among plumbers. It is cheaper than copper, easy to install, and more resistant to freezing temperatures. However, it may not be as durable as copper. 3. PVC: PVC (Polyvinyl Chloride) is a plastic material used for drainage, waste, and vent systems. It is generally cheaper than copper and easier to install, but it is not suitable for hot water applications. 4. CPVC: CPVC (Chlorinated Polyvinyl Chloride) is a plastic material that is similar to PVC but can handle higher temperatures. It is commonly used for hot water applications. 5. Galvanized steel: Galvanized steel is a metal material that is commonly used for water supply lines. It is durable and long-lasting but is prone to corrosion over time. 6. Cast iron: Cast iron is a heavy-duty material that is commonly used for sewer and drain lines. It is strong and durable but can be expensive and difficult to install. 7. Brass: Brass is a metal material that is commonly used for valves and fittings. It is durable, resistant to corrosion, and can handle high temperatures. However, it is expensive and heavy.