HPC Fire Linear Trough Fire Pit Insert MLFPK24 TRGH-FLEX-LP-STLinear Trough HPC Fire Pit Insert MLFPK24 TRGH FLEX LP ST Product Details These certified gas fire pit inserts incorporate a whistle free flex line between the gas valve and burner pan offering insert flexibility and simpler installation. Includes: Trough pan, T Burner, bracket, spider guard screen, and key valve. How It Works Start Up: This is done by lighting a long stem lighter next to the perimeter of the burner then slowly opening the key to the