TiAL -4 AN Oil Feed Fitting for GT Ball Bearing Turbos (GT28R/GT28RS/GT30R/GT35R) - 0.030" Orifice (Stainless Steel) Item ID: TIALOFF-030 Size (spec): -4 AN x 7/16-24 Thread w/ 0.030" Orifice Material (spec): Stainless Steel