A differential breather serves the important purpose on a 4X4 of venting the air pressure in your drivetrain assemblies such as differentials, gearbox and transfer case to atmosphere. When these assemblies heat up under normal operation the air inside them expands, increasing the pressure, and needs to be vented to atmosphere. Likewise, when the assembly cools down the air inside contracts, creating a vacuum. Many drivetrain assemblies are fitted with a breather from the factory. The factory breather is usually a one-way valve mounted directly to the axle housing or remotely on a short tube. The problem with the factory breathers arises particularly when driving through water crossings. In this scenario the drivetrain assembly will cool rapidly creating a vacuum. This sucks the one-way valve tightly shut, causing air to be instantly drawn into the assembly through the axle/shaft seals. However because the seals are probably still below water, then water will be drawn into the drivetrain contaminating the oil and possibly damaging drivetrain components or your Air Locker. The contaminated oil will then need to be changed. The RAYTEEN Differential Breather Kit is designed to eliminate these shortcomings by providing a high flow, zero backpressure, zero vacuum breather system. This is achieved with a central high flow air filter and manifold that will allow up to four drivetrain assemblies to be vented to one central location on the vehicle that will be above the water level at all times. This kit is intended to replace your factory breathers or add new breathers and it contains enough fittings and tubing to connect at least two drivetrain assemblies. More tubing and fittings can be purchased separately to connect up to four to the central manifold. The RAYTEEN Differential Breather Kit is unique in that it uses strong 6mm/0.24in POLYAMIDES tubing (where most other kits use thin polyurethane tubing that cannot bear the pressure).