The Gaslow Switch 2 is for pre 2004 models. It is a twin cylinder connection system that uses your existing regulators.Designed for the low pressure side of your gas system after the regulators The two supply inlets are controlled by a two-way tap and can use either butane or propane as desired. The Switch 2 makes changeover easy and allows the empty cylinder to be removed without switching off the gas supply. It is supplied with 3 worm drive clips and mounting bracket.