4AN Oil Feed Flange Adapter w/ Gasket For Oil Cooled Turbo 4AN Oil Feed Flange Adaptor with Gasket Thread size 4an, Built in oil restrictor to Protect your turbo from high pressured oil feed Fit T3 T4 T35 T40 T60 T67 T70 T76 (fit almost all oil cooled turbo charger) Two Mounting Screw holes Centerline to Centerline is 1.5" Billet Aluminum CNC Made, High Quality