–12AN Cummins Block Drain Fitting
Route your turbo oil return line the right way with a purpose-built fitting designed specifically for the Cummins block drain port — no adapters, no compromises.
Features & Benefits
Direct-Fit Cummins Block Drain Port Design
This fitting is engineered as a direct replacement for the factory Cummins block drain plug, giving you a clean, dedicated connection point for your turbo oil return line. It is built for the job, not a generic AN adapter pressed into service.
–12AN Male Fitting on the Drain Side
The –12AN thread mates directly with standard –12AN braided stainless or rubber drain hose, so you get a secure, leak-free oil return connection from turbo to block without stacking adaptors or improvising a fit.
Supports Proper Oil Drain Flow and Angle
Correct oil drain geometry matters. A sluggish or restricted return line can lead to oil backing up in the turbo centre section. This fitting helps maintain proper flow and drain angle to keep your turbo running clean.
Eliminates Stripped Factory Plug Risk
The factory Cummins drain plug location sees plenty of abuse over the years. Swapping to this machined fitting gives you fresh, precision threads and a reliable seal, so you do not have to worry about an over-torqued or corroded OEM plug.
Compatible with 5.9 and 6.7 Cummins Applications
Whether you are building out a 5.9 Cummins or a 6.7 Cummins platform — stock turbo location or full aftermarket setup — this fitting is designed to work with the Cummins block drain port.
True North Turbos (TNT) / Black Sheep Industries Quality
Designed and produced by Black Sheep Industries, the same Canadian team behind the True North Turbos line. Built to the same standard as the components trusted in serious diesel performance builds across North America.
If you are putting together a proper turbo oil drain setup on your Cummins, this is the fitting to start with: clean, correct, and built to last.
FAQ
What is this Cummins block drain fitting used for?
This fitting is used to create a clean, dedicated connection point for a turbo oil return line at the Cummins block drain port.
Does this fitting replace the factory Cummins block drain plug?
Yes. It is engineered as a direct replacement for the factory Cummins block drain plug.
What hose type does the –12AN side work with?
The –12AN thread mates directly with standard –12AN braided stainless or rubber drain hose.
Is this fitting compatible with 5.9 and 6.7 Cummins applications?
Yes. This fitting is designed to work with the Cummins block drain port on 5.9 Cummins and 6.7 Cummins applications.