Gas Valve - Natural Gas Burner Tray Assembly Igniter Window Glass w/ Holder Flame Sensor Gas Manifold w/Orifices, 0-4000 Gas Valve - (Natural/Propane) Burner Tray Assembly (Natural/Propane) Igniter Flame Sensor Gas Manifold w/ Orifices (Natural/Propane) Orifices (Natural/Propane) Burner/Burner w/ Bracket Gas Orifices, 0-4000 Burner Air Pressure Switch, 0-2000' Module, Ignition Control Temperature Controller Assembly Right Door Assembly (with or w/o Controller) Left Door Assembly O-Ring, Adapter Adapter, Bulkhead Ring Adapter, Bulkhead, 2" Gasket, Fin Tube, Seal Flow Valve Assembly Power Element, Flow Valve Jacket, Upper Panel, Left Jacket, Upper Panel, Right Jacket, Upper Sub-Plate Junction Box Assembly Hi-Limit Thermostat-150° F Water Pressure Switch In/Out Bottom Sub-Header In/Out Top Sub-Header Assembly In/Out Main Header Assembly Washer, Heat Exchanger Fire Box Assembly Heat Exchanger (w/ or w/o headers) Thermistor Probe Hi-Limit Thermostat -115° F Gasket, Exhaust Grill Exhaust Assembly Blower, w/Gasket Gasket, Blower Flue Collector Insulation, Header/Hi-Limit Baffle, Heat Exchanger Bolt, Heat Exchanger Return Header Assembly Cap, In/Out Bottom Sub-Header Top Cover w/Posts Exhaust Grill w/Gasket Go Back parts4heating.com Exhaust Grill w/Gasket Gasket, Exhaust Grill Top Cover w/Posts Exhaust Assembly Gasket, Blower Blower, w/Gasket Flue Collector Insulation, Header/Hi-Limit Return Header Assembly Bolt, Heat Exchanger Baffle, Heat Exchanger Thermistor Probe Hi-Limit Thermostat -115° F Water Pressure Switch Hi-Limit Thermostat-150° F Adapter, Bulkhead Ring Adapter, Bulkhead, 2" Adapter, Bulkhead, 2" O-Ring, Adapter Cap, In/Out Bottom Sub-Header Gas Orifices, 0-4000 Flow Valve Assembly Power Element, Flow Valve Gasket, Fin Tube, Seal In/Out Top Sub-Header Assembly In/Out Bottom Sub-Header Igniter Burner Gas Valve - (Natural/Propane) Burner/Burner w/ Bracket Igniter Flame Sensor Orifices (Natural/Propane) Gas Manifold w/ Orifices (Natural/Propane) Window Glass w/ Holder Flame Sensor Temperature Controller Assembly Right Door Assembly (with or w/o Controller) Left Door Assembly Air Pressure Switch, 0-2000' Junction Box Assembly Module, Ignition Control Heat Exchanger (w/ or w/o headers) Washer, Heat Exchanger Jacket, Upper Panel, Right Jacket, Upper Sub-Plate Jacket, Upper Panel, Left Gas Manifold w/Orifices, 0-4000 Gas Valve - Natural Gas Fire Box Assembly 400 Models Starting with Serial Number 12040039