Gap Closure Drain Valve Temp/Pressure Gauge Immersion Well Immersion Well Flue Collector Pump Relay Transformer Control Box Cover Terminal Strip High Limit Switch Burner With Pilot Bracket Pilot Assembly Gas Manifold Pilot Gas Tube Gas Valve Burner Cover Flame Roll-Out Safety Switch Tile Cover Blocked Vent Safety Switch Refractory Rear Heat Exchanger Draft Diverter Vent Damper Pressure Relief Valve Vent Damper Connection Harness Go Back Orifices Pilot Gas Tube 2 Stage Operating Control