Sprinkler fitter injuries on the job occur in single traumatic accidents or from sprinkler installer job duties over time. Sprinkler fitter job duties include installing automatic fire sprinkler systems in new construction and retrofitting systems in existing buildings in all types of construction, mostly commercial, using valves, hangers, steel and plastic pipe. They lay out, assemble, install, and maintain pipe systems, pipe supports, and related hydraulic and pneumatic equipment for steam, hot water, heating, cooling, lubricating, sprinkling, and industrial production and processing systems.