There are several different style of Drain flanges for each make of turbo.  We measured all of our flange type using a bolt spacing distance (the distance between the center of each bolt holes). 

Main Features:

                  - CNC Aluminum Billet construction  
                  - Comes with High Temp Gasket

ALL Drain flanges have 1/2" NPT Female thread

FTODR1 - T3, T4, T3/T4, Borg Warner, Journal Bearing GT, Holsett HX and HY series, and many more.  2" Bolt Spacing

FTODR2 - T25, GT Ball Bearing, Greddy TD04, TD05, TD06, Greddy 517Z (K-Series Kit) and many more.  1.5" Bolt Spacing

FTODR4 - JDM T25, T28 Stock Nissan SR20 Turbo.  1.75" Bolt Spacing

To ensure perfect fitment for your application, please enter your turbo make and model in the space provided

To adapt the flanges to an NPT fittings, please check out the AN to NPT adapter category,

https://www.fast-turbo.com/categories/Hoses-and-Fittings/Adapters-and-Fittings/AN-to-NPT/