Plumbing Safety A plumber installs, repairs, and maintains plumbing fixtures or systems in businesses, industries, or residences. The job may include installation and repair of pipes, fittings, and fixtures servicing the water supply, waste disposal, and heating systems. Plumbers must also haul supplies, cut, and assemble plumbing materials, and use equipment and tools. Plumbing is a simple name for a job that has a wide variety of duties. Chemical and material exposures are common for plumbers, so get training on the potential hazards at the job sites that you are assigned. Find out if your jobsite has asbestos, lead paint, or mold....