The Gaslow Propane Manual Changeover Gauge (Standard) is designed to create a twin cylinder gas system for caravans/motorhomes fitted with a fixed 30mbar regulator.Complete with a Gaslow Propane Gauge it is ideal for Gaslow Refillable Cylinder Systems or for any other propane cylindersWe also stock a wide range of hoses to suit many cylinders - all of which are compatible with this unit.Because it is a Gaslow Gauge it also acts as a low gas level indicator and leak detector.The standard T configuration should be used if the regulator is located centrally within your gas locker.