HD GT15-GT35 Billet Turbo Oil Return Drain Flange T3 1/2npt GT25 GT30 551163 T3 Flange (Fits Garrett GT15-GT35) 1/2" NPT 1-1/2" to 1-3/4" Bolt Spacing Includes (1) Drain Flange, (1) Gasket, (2) Bolts