The Gaslow W20 Changeover Gauge Propane Side 01-1632 has been designed to create a twin gas system for caravans and motorhomes. This manual changeover unit simply screws onto your bulkhead mounted 30mbar regulator and allows you to reconnect your existing regulator hose and with an additional regulator hose turn your system into a manual changeover, with built in leak detection and low level indicator. This configuration is for 30mbar regulators which are not fitted upright in the middle of the gas locker, but are fitted sideways in the corner of the gas locker. The Gaslow W20 Changeover Gauge Side 01-1632 is designed for Propane gas only.