ARB Differential Breather Kit — High-Flow 4-Port Manifold with Elevated Filter, Zero Back-Pressure

ARB’s Differential Breather Kit (170112) is a high-flow, four-port manifold system that vents up to four drivetrain assemblies to one elevated filter to reduce water ingestion and eliminate back pressure.

When off-road driving or water crossings raise the temperature and pressure inside differentials, gearboxes and transfer cases, a proper breather prevents contaminated fluid and seal failure. The ARB Differential Breather Kit centralizes vents to a single, high-mounted air filter and manifold engineered for maximum airflow with zero back pressure or vacuum, helping keep lubricant clean and components functioning longer.

How does the ARB breather system protect drivetrain components?

The kit directs expanding air and vapors from multiple gearbox and axle housings into a single elevated filter, blocking water entry and reducing internal pressure spikes. Unlike simple caps, this design maintains neutral pressure without restricting airflow.

• Manifold accepts up to four breather lines, consolidating vents at one high point.
• High-flow air filter prevents water and large contaminants from entering vents.
• Zero back pressure design avoids stressing seals during thermal cycles.
• Elevated mounting position reduces risk of water immersion during crossings.

What comes in the ARB 170112 kit and what do I need to install it?

The package includes everything to plumb four breathers to the central manifold and secure the filter in a convenient, raised location. Basic hand tools and a few minutes per breather are all that’s typically required for a tidy installation.

• Manifold block with four ports and one filter port for a consolidated layout.
• High-flow air filter assembly plus push-in fittings, tubing, plugs and screws.
• Cable ties and mounting hardware to route and secure lines neatly.
• Instructions for positioning the filter high on the chassis to avoid water.

Will this breather kit fit my vehicle and drivetrain layout?

The ARB manifold is universal for most automotive differentials, transfer cases and gearboxes, providing flexible placement of up to four breather lines. Verify hose routing length and mounting clearance for the filter to ensure a clean, elevated install on your chassis.

• Suitable for most axles, transfer cases and gearboxes needing remote venting.
• Four-port capacity allows a single central filter for multiple components.
• Flexible tubing and push-in fittings adapt to common vehicle layouts.
• Check clearances and preferred mounting points before final routing.

How does installing this kit change maintenance or performance?

Once installed, the kit reduces the chance of water contamination and excessive internal pressure, helping seals and oil remain in good condition longer. It’s low-maintenance: the filter is serviceable and only needs occasional inspection after heavy mud or water exposure.

• Lower risk of oil contamination during water crossings or deep mud.
• Reduced stress on seals during hot-cold cycles due to neutral venting.
• Periodic filter checks and cleaning keep the system effective.
• Simple replacement parts: tubing, fittings and filter if needed.

Who is this for: The ARB Differential Breather Kit is aimed at off-road enthusiasts, overlanders and anyone who regularly encounters water, mud or dusty conditions and wants a reliable, high-flow venting solution for multiple drivetrain components. It’s ideal for builders consolidating several breathers into one elevated, serviceable location and for vehicle owners who prefer a robust, low-restriction alternative to stock breather caps.