Discover Our Flame-Sensing Battery Spark System NEW!   Flex Line Models These certified inserts incorporate a whistle-free flex line between the gas valve and burner pan offering insert flexibility and simpler installation. Perfect for fire pits without electricity and need for flame sensing. Flex line configuration Flame sensing – flame blows out, gas will turn off Spark ignition – No match required. Complete drop-in fire pit insert utilizes a standing pilot with thermocouple to safely control gas flow, manual spark igniter (AA battery), and safety pilot valve. CSA Certified up to 140,000 BTU Comes fully assembled with #304 stainless steel pan & burner, FPPK-HC control box with pilot assembly, and whistle-free flex line. Interlink Linear Pan Models- FLEX Model # / Description FPPK25X8-L-FLEX – 25×8” Pan, 24” T-Burner, 36” Flex Line, 50k Btu FPPK37X8-L-FLEX – 37×8” Pan, 36” T-Burner, 36” Flex Line, 75k Btu FPPK49X8-L-FLEX – 49×8” Pan, 48” T-Burner, 36” Flex Line, 100k Btu FPPK61X8-L-FLEX – 61×8” Pan, 60” T-Burner, 36” Flex Line, 125k Btu FPPK73X8-L-FLEX – 73×8” Pan, 72” T-Burner, 36” Flex Line, 140k Btu FPPK97X8-L-FLEX – 97×8”