- Manifold with 5 ports and 2 mounting holes
- 4 x 1/8″ BSP ports for connecting up to 4 breather lines
- 1 x 1/4″ NPT ports for the air filter
- Air filter assembly
- 4 x 8mm-1/8″ BSP push in fittings
- 3 x 1/8″ BSP plugs for plugging unused ports
- 8m x 8mm Polyethylene tubing
- 2 x self tapping screws
- 25 x cable ties
Why a Differential Breather
A differential/axle breather serves the purpose, on a 4X4, of venting the air pressure in your drive train assemblies such as differentials, gearbox and transfer case to atmosphere. When these assemblies heat up under normal operation, the air inside 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 drive train assemblies have factory fitted breathers. 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. Therefore the drive train assembly cools 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, water is drawn into the drive train contaminating the oil and possibly damaging the drive train components or you Air Locker.
How to Fix the Problem
We recommend the ARB Differential Breather Kit, designed to eliminate these shortcomings by providing a high flow, zero back pressure, zero vacuum breather system. This is achieved with a central high flow air filter and manifold that will allow up to four drive train assemblies to vent to one central location on the vehicle that will be above the water level at all times. This kit replaces you factory breathers or add new breathers and it contains enough fittings and tubing to connect at least two drive train assemblies. More tubing and fittings can be purchased separately to connect up to four to the central manifold.