Gas Safe Register is the official list of gas engineers who are qualified to work safely and legally on gas alliances. By law all gas engineers must be on the Gas Safe Register. It has replaced CORGI registration. Gas Safe Register is there to keep you and your family safe. Badly fitted and poorly serviced gas appliances can cause gas leaks, fires, explosions and carbon monoxide poisoning. Only use a Gas Safe registered engineer to fit, fix or service your gas appliances.