This is a T series turbo oil drain fitting. This fitting allows you to build custom oil lines to your new turbo setup. Works perfectly with the Garrett T-Series gasket. Every detail has been considered, the machining is very high quality.
This fitting has bolt holes that are 2.00 inches (on-center) from each other. If you have a Precision "GT" turbo, please confirm with them, that the drain is actually a T-series bolt pattern drain. Most aftermarket turbos (not made by Garrett Turbos) use a T-Series bolt pattern and the mounting bolt holes are 2.00 inches (on-center).