Aluminum Coolant Overflow Expansion Tank for Ford F250 F350 (2003-2007) 6.0L EngineEliminate the weakest link in your cooling system before that brittle factory plastic leaves you stranded on the side of the highway with a steam cloud. Aluminum Coolant Overflow Expansion Tank for Ford F 250 F 350 Super Duty & Excursion If you drive a 2003 2007 Super Duty, particularly the 6. 0L Powerstroke, you know the "Degas Bottle" struggle. The factory reservoir is made of molded plastic that sits right in the hottest part of the engine bay.