Designed in 1835, the gas regulator's concept is easy, and its impact has been long-lasting. There are various types of regulators, but their function is the same: to use a valve system to control natural gas or propane pressure or other gas flow. Common appliances that use regulators include gas stoves, propane grills, or oxy-fuel bottles for welding. Each type of regulator's components consists of a set spring attached to a rod that runs down from a set screw through a diaphragm into the valve. http://www.peakgasregulator.com/gas-regulator/