Gas lines are a series of pipes that carry natural gas, a flammable fossil fuel, from its supply source to its end source. By “end source” we mean anything from a gas stove to a gas water heater, furnace, washer/dryer, or any other gas appliance located in a house, business, or industrial facility. These appliances utilize the natural gas delivered to them through the gas lines to provide heat for water heating, cooking, and other essential, everyday functions.