These differential plugs are designed to replace the factory fill and drain plugs so that remote oil cooler lines can be run to the differential.

Instead of drilling, tapping, threading a factory or aftermarket differential cover to run additional lines, you can now use the Rogue Engineering plugs, drilled with a 1/8 NPT thread.  This allows for the use of commonly available adapters and fittings to be used.

Sold as a pair, includes copper crush washers.