The MERCURY IGNITION SYSTEM™ provides a layer of safety in the event aburner's flame is unexpectedly extinguished. This innovative new designprovides a quick, automatic shutoff of gas flow and an easy reset to reignite theflame when ready to address building and safety code requirements, as well aspersonal safety preferences. Ignition Types Mercury Ignition Spark Igniter with Internal Safety Shutoff + 3' Pilot for use with any Burner up to 240K BTU + FIT180 + Natural Gas Mercury Ignition Spark Igniter with Internal Safety Shutoff + 3' Pilot for use with any Burner up to 240K BTU + FIT180 + Liquid Propane FKM Options FKM1 - Mercury Ignition Single Flex Line kit - For use with any burner 249K BTUs and below. Kit includes: (1) 36" L x 3/4" Diameter Flex Line + (1) 1/2" x 2" Nipple FKM2 - Mercury Ignition Single Flex Line kit - For use with any burner 249KBTUs and below. Kit includes: (1) 36" L x 3/4" Diameter Flex Line + (1) 1/2" x 2" Nipple Manuals Mercury Instruction Manual Mercury Instruction Manual - Spanish