The L61 And L62 Series Baso Safety Shutoff Devices Are For Use On All Gas-Fired, Standing Pilot Equipment That Requires Main Burner Shutoff When The Pilot Is Extinguished. Typical Applications Include Domestic Central Heating And Commercial Space Heating Appliances, As Well As Industrial Processing Equipment (For Example, Die-Casting Machines And Degreasers). The L61 And L62 Monitor The Pilot Flame Through The Use Of A Thermocouple In 100% Shutoff Model L62Gb Applications, If The Pilot Flame Is Extinguished, The Switch Will Interrupt Gas Flow To The Main Burner And Pilot Burner, Shutting Down The Appliance. In Non-100% Shutoff Models L61Ll And L62Aa Applications, If The Pilot Flame Is Extinguished, The Switch Will Interrupt Gas Flow To The Main Burner Only, Shutting Down The Appliance. Pilot Gas Will Continue To Flow Until The Pilot Gas Is Manually Shut Off. Made in United States. Manufactured by Baso Gas Products LLC.