Pennine 21mm clip on regulator for use with 7kg and 15kg Butane gas bottles. Operating Pressure is 28 mbar, with a 8mm outlet nozzle. N.B You may find an instructions leaflet stating 'not to be used in caravans'. European standard EN12864 states that after 2004 all new caravans and motorhomes must be fitted with a 30mbar regulator. The instructions reflect this standard. Therefore caravans and motorhomes built before 2004 may not have a 30mbar regulator and the appliances may not work at 30mbar, depending on the make of vehicle. Part number T21CLON.