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The selection identifies essential materials used in plumbing, which are critical for various aspects of the plumbing system. PVC pipe is utilized for drainage, waste, and venting due to its resistance to corrosion and low cost. Solder is essential for joining copper pipes, which are commonly used for water supply lines because of their durability and resistance to bacterial growth. Copper pipe itself is a fundamental material in plumbing, known for its longevity and effectiveness in delivering hot and cold water. Plumber's putty is a sealant that is critical for ensure leak-proof joints, particularly in areas where pipes connect to fixtures.

Each of these materials serves a specific purpose within plumbing systems, ensuring that installations are both functional and reliable. The other options consist of materials that do not directly pertain to plumbing tasks. For instance, dielectric grease and electrical tape are unrelated to plumbing, focusing more on electrical work. Similarly, wood glue, primer, cement, and paint are utilized in carpentry and finishing processes, while concrete and structural materials like beams are used in construction but not specific to plumbing.