Get the most out of your Garrett Turbocharger with Vibrant Performance's high quality water jacket fittings. Water cooling will improve the performance and durability of your turbo. With Vibrant Aluminum Water Jacket Adapters you can easily plumb AN water lines to prevent oil coking in your Garrett GT28, GT30, GT35, GT40, GT42 or GT45 Turbocharger. Coke deposits can plug up your oil feed and drain lines, effectively starving your turbo of oil, which could lead to premature bearing failure.