TAD520GE; TAD720GE; TAD721GE; TAD722GE Intake and Exhaust System Air Heaters TAD520GE, TAD720GE, TAD721GE, TAD722GE Parts on group Air Heaters: Pos. Part No Qty Parts name Comments 1. 20758403 [1] Heater, 24V 2. 20498498 [1] Connector, -pole 3. 20498524 [1] O-ring 4. 20550356 [5] Flange screw 5. 20550336 [5] Insulator 6. 984735 [2] Flange screw 7. 20758437 [2] Insulator 8. 20726089 [1] Connector, +pole 9. 20521558 [1] Insulator Parts catalog : Inlet Manifold TAD721GE, TAD722GE Inlet Manifold TAD720GE Intake Manifold TAD520GE Exhaust Manifold and Turbocharger. Low Mounted Turbo. Exhaust Outlet Front. Stage 1, Tier 1 TAD520GE Exhaust Manifold and Turbocharger. Low Mounted Turbo. Exhaust Outlet Front. Stage 1, Tier 1 TAD720GE Exhaust Manifold and Turbocharger. Low Mounted Turbo. Exhaust Outlet Front. Stage 2, Tier 2 TAD520GE Exhaust Manifold and Turbocharger. Low Mounted Turbo. Exhaust Outlet Front. Stage 2, Tier 2 TAD720GE Exhaust Manifold and Turbocharger. Low Mounted Turbo. Exhaust Outlet Front. Stage 2, Tier 2 TAD721GE, TAD722GE Air Filter and Induction Manifold. Stage 1, Tier 1 TAD520GE