Complete Factory Direct Replcement Firing/ Burner Tube Kits for GFP models CB, SIR, LTS, LTU, ETS, SIS, ETU, SIU, CTS & CTA models. Kits do complete with all neccessary hardware for installation. Notes: * 5ft. Replacement tubes ship via UPS *10ft & 15ft. Replacement tube kits MUST SHIP LTL-MOTOR FREIGHT-minimum $210.00 (1-4 tubes) * All CB & LTU40-75 models are 3" diameter tubes and are ALC tubes * All LTU80-250, LTS40-250, ETS/U models are 4" diameter tubes * LTS, ETS/U 40-200 & LTU80-200 models have ALC burner/ firing tubes * LTS/U, ETS/U 225-250 MBTU models have ATC burner/ firing tubes ATC = Calorized, Alum-Therm Steel - 6 Hole Flange - 20-200,000 Btu capacity ALC = Calorized, Aluminized Steel - 12 Hole Flange - 225 & 250,000 Btu capacity HRS = Hot Rolled Steel 5ft. tubes ship via UPS ground , 10ft. & 15ft. tubes must ship via motor freight and are a minimum shipping charge of $168.00.