A pipe fitter installs, assembles, fabricates, maintains, and repairs mechanical piping systems, reading blueprints to determine pipe layouts and using tools to cut, bend, and thread various materials like steel and copper. Key responsibilities include adhering to safety regulations, performing inspections and repairs, and collaborating with other construction professionals on industrial, commercial, and residential projects. It's a physically demanding job requiring technical skill, attention to detail, and the ability to work in diverse environments, often involving heavy lifting and working at heights.