Work frequently requires kneeling, bending, stooping, reaching outward and upward, balancing, crouching, crawling, standing on ladders; frequently in awkward positions or close spaces to be able to reach pipes and/or fittings. Assembles and installs valves, pipe fittings, and pipes composed of metals, such as iron, steel, brass and lead, and nonmetals, such as glass, vitrified clay, and plastic.