Manhole chambers are underground access points used in sewage and drainage systems to facilitate inspection, cleaning, and maintenance of pipes. They typically consist of a base, sectional risers, and a manhole cover at ground level. Manhole chambers are available in various materials like concrete, plastic, and PE, and come in different sizes to suit specific requirements. They are designed to withstand heavy loads and provide a watertight structure to prevent infiltration and exfiltration.