The 4×4 differential breather kit is designed to elevate the breathing ports of the diff to eliminate water entering. This kit allows the diffs to cool and the air inside the diff to contract without sucking in water. A must for 4wd drivers that will be wading through water. This kit has 2 ports available for front and rear diffs and also 2 ports for gearbox and transfer case if required. Kit comes complete with all fittings generally required.