The ARB Differential Breather Kit allows excess ventilation pressure to escape in your vehicle’s drivetrain assemblies such as the differentials, transmissions, and transfer cases. At times these assemblies can heat up allowing the air inside to expand which increases pressure. The ARB Differential Axle Breather Kit will allow this excess pressure to vent into the atmosphere, however when the assembly cools down, the air inside will contract and create a vacuum. Although many drivetrain assemblies are fitted with a factory breather, those breathers are designed as a one-way valve either mounted on the housing, or mounted remotely on a short tube. The flaw in this design is that driving through water will create a vacuum caused by the drivetrain being cooled, which causes the valve to shut causing air to be instantly drawn into the assembly through the seals. This will cause water to enter the drivetrain contaminating the oil and damaging your drivetrain components. The ARB Differential Axle Breather Kit eliminates this flaw by providing a high flow, with no back pressure, zero vacuum breather system. This is achieved with a high flow filter within a central manifold that will allow up to four drivetrain assemblies to be vented in one central location anywhere that will stay above water. This kit will replace your factory breather system, and will contain enough fittings and tubing to connect to at least two drivetrain assemblies. This kit uses 8mm tubing which is larger than your typical 6mm tubing, and larger tubing is essential in 4X4 applications where off camber driving can cause oil to block smaller breather lines.