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Regulators are necessary to reduce the pressure of LPG in the cylinder or cartridge to the much lower pressure that is used by the appliance. Each country has their own settings for domestic applications, typically in the UK, butane regulators are pre-set at nominally 28-30 mbar and a propane regulator is pre-set to 37mbar, however for some touring caravan and motorhome applications designed and built to standard EN 1949 the regulators are installed by the manufacturer and pre-set at 30 mbar for both butane and propane. Regulators for other applications (such as plumbers torches) operate at higher pressures and are often fitted with adjustable regulators.