Jacket Top Assembly Blower Gasket 1/4 in NPT Brass Plug Rear Header Only Combustion Blower Pressure Switch Adapter Rear Wire Harness Hi Limit 160F Header O Ring Heat Exchanger Assembly Front Header Assembly O Rings Flange Pipe Nipples Flange Pipe Nipples Union Nuts Left Access Cover Interlock Switch Plastic Hardware Kit Upper Right Access Cover Transformer Plastic Hardware Kit Thermostat Thermostat Pressure Switch Assembly Ignitor Assembly LED Kit Plastic Hardware Kit System Switch Gas Valve Lower Right Access Cover Gas Manifold Front Access Door Assembly Burner Orifice Burner Tube Control Panel Assembly Control Module TA-2 Ground Lug By Pass Valve Kit Header O Ring Flow Control Thermostat 3/4 in NPT Brass Plug Front Header Only Drain Valve Assembly Hi Limit 135F Bulb Well, Cotherm Jacket Top Assembly Combustion Blower Rear Header Only Pressure Switch Adapter Hi Limit 160F Header O Ring Heat Exchanger Assembly Front Header Assembly Rear Wire Harness O Rings Flange Pipe Nipples Union Nuts Left Access Cover Plastic Hardware Kit Plastic Hardware Kit Pressure Switch Assembly Control Module Transformer Front Access Door Assembly Gas Valve Burner Tube Gas Manifold Burner Orifice Lower Right Access Cover Upper Right Access Cover System Switch Control Panel Assembly Ignitor Assembly By Pass Valve Kit Header O Ring Flow Control Thermostat 3/4 in NPT Brass Plug Hi Limit 135F Drain Valve Assembly Bulb Well, Cotherm Front Header Only