A gas fitter is a professional who installs, maintains and repairs gas appliances and piping systems. This job requires expertise in working with gas and an in-depth understanding of gas regulations and safety. Synonyms for the term "gas fitter" include gas plumber, gas technician, gas engineer, gas installer, and gas specialist. All of these terms denote someone who has the necessary skills and experience to work with gas, but their specific role may differ. A gas engineer, for example, is usually involved in designing gas systems for buildings or large facilities, while a gas plumber is primarily responsible for installing and repairing gas appliances for homes and small businesses.