POU stands for Point of Use. It is a valve as a minimum, normally mounted on the wall, bench or panel, which is at the point where the gas is used. In most cases a regulator with an outlet pressure gauge is mounted afterwards. Together with the gas panel it guarantees a very stable outlet pressure and handles any pressure changes that may be caused in the central gas supply system. Metering valve, check valve, safety relief valve and flashback arrestor are typical accessories mounted on the POU.