Performed a comprehensive replacement of the vitreous china water closet fixture in the primary residential bathroom. Disconnected the existing unit from the waste line and water supply lines after turning off valves to isolate plumbing. Removed the old toilet and wax seal. Prepared subfloor for new installation using appropriate sealants and mounting hardware. Installed new 1.28 GPF high-efficiency elongated bowl toilet per manufacturer specifications. Reconnected supply line with reinforced hose and waste line with slip-joint connection. Tested for leaks and proper flushing operation. Disposed of old toilet responsibly.