A manhole is an access point designed for entry into tanks, vessels, pipelines, or underground utility systems for inspection, maintenance, and cleaning. Typically constructed from materials like steel, cast iron, or reinforced concrete, manholes come in various shapes, including circular, oval, and rectangular, depending on the application. In industrial settings, manholes are equipped with bolted or gasketed covers to ensure airtight sealing, preventing leaks and maintaining pressure integrity. They are widely used in industries such as wastewater treatment, oil and gas, and chemical processing. Proper design and placement of manholes enhance safety, facilitate easy access, and ensure efficient system maintenance.