The Model C6097 Gas Pressure Switch is designed to detect city gas, natural gas, LP gas, and Air. The external electrical circuit is turned on and off according to the preset value. This device can be used in various ways, including detection of minimum/maximum gas/air pressure supplied to the device, burner blower interlock, or filter clogging. There is a switch action display light for switching pressure as an option, sold separately. Non-UL approved. FM approval pending.