ARB Differential Breather Kit
SKU: ARB170112
Protect your drivetrain from water contamination and pressure/vacuum damage with the ARB Differential Breather Kit—a high-flow, zero back pressure, zero vacuum breather system designed specifically for harsh 4x4 and off-road environments.
Factory breathers are typically one way valves mounted low on the axle or transmission housing. The problem? During water crossings, drivetrain components cool rapidly, creating a vacuum that slams the one way valve shut. When this happens, the assembly pulls air, and often water, back through the seals, contaminating your gear oil and putting critical components (including ARB Air Lockers) at risk.
The ARB Differential Breather Kit eliminates this failure point entirely. Featuring a billet aluminum 4-port manifold, 8mm high flow tubing, and a splash resistant central air filter, this kit relocates all drivetrain breathers to a single elevated point on the vehicle. With enough components to route at least two assemblies (and up to four with additional tubing), this kit ensures your diff, transmission, and transfer case stay dry, no matter how deep the crossing.
Now featuring 8 meters of 8mm airline and fittings compatible with a wide range of factory breather threads.
Includes:
- Billet anodized aluminum 5-port manifold
- (4) 1/8" BSP breather line ports
- (1) 1/4" NPT air filter port
- Splash-resistant air filter assembly
- (4) 8mm → 1/8" BSP push-in fittings
- (3) 1/8" BSP port plugs
- 8 meters of 8mm polyethylene tubing
- (2) self-tapping mounting screws
- (25) cable ties
- Full instructions
Specifications
- Manifold Material: Anodized billet aluminum
- Ports:
- (4) 1/8" BSP ports for axles, diffs, transmission, transfer case
- (1) 1/4" NPT port for air filter
- Tubing:
- 8mm OD high-flow polyethylene tube
- 8 meters included
- Mounting: Compact design for installation in any elevated location
- Air Filter: Splash-resistant, high-flow central vent
- Axle Fitting Thread Pitch: Fits a wide range of factory breather locations
- Compatibility: Supports 1–4 drivetrain assemblies (more tubing can be added)
Fitment
- Universal system compatible with:
- Front & rear differentials
- Transmission
- Transfer case
- Any drivetrain assembly requiring pressure venting
- Ideal for:
- Jeeps, trucks, SUVs
- Rock crawlers & bouncers
- Overland rigs
- UTVs/SxS (with adapters)
- Expedition vehicles frequently crossing water
Tech Insight
ARB designed this system to solve the biggest flaw in factory breathers: vacuum lock during water crossings. When a hot drivetrain hits cold water, the sudden pressure drop pulls contaminants through seals if the one-way valve closes. The ARB Breather Kit prevents this by using a zero vacuum, zero back pressure open system, venting through a high mounted air filter.
Unlike competing kits that use smaller 6mm hose, ARB uses 8mm tubing—critical for steep off camber driving where oil can pool and block narrow lines. The 4-port manifold allows you to cleanly route up to four breathers to one protected location, ensuring long term drivetrain reliability and reduced service intervals.