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

ARB Differential Breather Kit (170112) is a high-flow, four-port manifold system that vents up to four drivetrain assemblies to a single elevated filter, preventing water ingress while maintaining zero back-pressure.

Whether you cross rivers, drive through deep mud, or tow heavy loads, your differentials, transfer case and gearbox are vulnerable to water and pressure-related contamination. The ARB 170112 provides a centralized breather solution: a high-flow air filter and manifold that routes venting lines to a single, raised location. This reduces the chance of oil contamination and unwanted vacuum or pressure build-up inside sealed drivetrain components.

How does this breather kit keep water out of my drivetrain?

The kit positions the vented filter high on the vehicle and uses a sealed manifold to collect venting lines from up to four assemblies. By routing all vents to an elevated, filtered outlet, water spray and submersion during crossings are far less likely to reach oil and bearings.

• High-mounted filter location reduces water entry during river crossings.
• Four-port manifold consolidates multiple breathers to one protected point.
• Push-in fittings and secure tubing maintain airtight vent paths.

Will the ARB breather affect pressure inside differentials or gearbox?

No. The system is engineered for high flow with essentially zero back pressure and zero vacuum, so internal component pressures can equalize naturally as temperatures change. This prevents seals from being forced or sucked in, helping to preserve seal life and oil integrity.

• High-flow air filter allows unrestricted venting during thermal expansion.
• Zero back-pressure design avoids added strain on seals and housings.
• Manifold balances venting across up to four connected assemblies.

What parts are included and how easy is installation?

The ARB 170112 kit ships with everything needed to route breathers to the central filter: a four-port manifold, air filter assembly, push-in fittings, tubing, plugs, mounting screws and cable ties. Typical DIY installation requires basic hand tools and routing each existing breather line up to the manifold’s ports.

• Complete kit: manifold, filter, tubing, fittings, mounting hardware and ties.
• Push-in fittings simplify hose attachment without special tools.
• Can be mounted high on chassis or firewall using supplied screws.

How will this kit perform in off-road and towing situations?

Designed for off-road conditions and heavy-duty use, the ARB Differential Breather Kit helps prevent water and contaminants from entering drivetrain oil during crossings and deep splashes. It also helps maintain reliable venting under continuous load or heat buildup, so drivetrain components run cleaner and longer.

• Durable filter element stands up to muddy and wet environments.
• Consolidated venting reduces maintenance points and leak risk.
• Improves confidence when fording, rock crawling, or towing in wet conditions.

Who is this for: The ARB Differential Breather Kit 170112 is aimed at 4x4 enthusiasts, overland travelers, off-road racers and anyone who regularly exposes their vehicle to deep water, mud or heavy towing. It’s well suited for owners who want a tidy, reliable solution to protect differentials, transfer cases and gearboxes without compromising vent performance.