Co₂is a colorless gas with a density about 60% higher that of dry air, considered as best extinguishing gas. it suppresses oxygen by eliminating heat, Co is most effective as a fire extinguishing agent. NFPA-12 Rules and BIS 6382 Codes for design of such system are used as standard for co Extinguishing or flooding system. Co gaş generally stored in high pressure seamless steel cylinders is in liquid form with maximum filling ratio of 0.667 Kg Ltr of cylinder vetme. According to the fire hazard Co2 cylinder quantity varies. On hazards where several conders are required a manifold is used to connect each other by means of flexible hose and check valve. The cylinder’s master valve is electronically operated and the slave valve is pressure actuated. The master valve can be automatically or manually operated. Flow rate of Co controlled.