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Our T4/T6 Billet Turbocharger Oil Drain Adapters come standard with a -10 AN fitting milled from a single Billet 6061 Aluminum stock. All of our oil drains feature a High Temp Silicone O-Ring that is rated for 450 Degrees. Running a large T4 charger featuring a M10x1.50 thread pitch? No worries click below and choose between our M8 x1.25 ( small hole pattern ) or M10X1.50 ( large hole pattern ). If you have questions on what bolt pattern is needed for your turbo, please feel free to give us a call 870-236-4900.