The ceiling mount 6KG ABC fire extinguishers have not been installed or tested. The mini valve-pressure gauge dials, on each extinguisher reflect maximum 'green' in that pressure gauge 'window'. This is the maximun pressure they are designed to reflect to users and security/fire professionals. These units were manufactured, filled with ABC dry powder, pressurized and shipped via freighter from The People's Republic of China, about five weeks in transport. The units are in fine condition. But, do they work? I hope I never find out.