Gas Proving Systems are required under BS6173 if any appliance is installed that is not fitted with a Flame Failure Device (FFD). This would normally only be applicable to small gas rings and hobs. It should be noted however that older grills, and even ovens, often have not been equipped with an FFD. In any event, a well designed gas proving system will test for external leaks not just the odd unprotected gas tap that may have been left turned on. Furthermore should an unprotected small appliance be fitted at some time in the future this will be a simple task if the GLT10 gas proving system is already installed. The GLT10 is a modern state of the art Gas Proving System, it has been designed and developed not only to meet all current standards but to exceed them. The GLT10 operates in several modes including the 'weep' system required in EN6173 and described in the Institute of Gas