Boss Airbag 4500 Double Bellows Bare

The 2400, 2500 and 2600 series are all double-bellow Boss airbags in different diameters and load capacities. 2400 bags are smaller in diameter, 2500 are the most common mid-size bag used in many Load Assist kits, and 2600 bags are larger and suit heavier-duty applications where there is more space available around the axle and chassis.

Triple-bellow airbags such as the 2503 and 2603 are used where you need more travel or a taller free height, typically on vehicles with more than 2 inches of lift or long-travel suspension. They allow the suspension to sit higher at a given pressure while still providing the correct load support.

No, airbags are generally only interchangeable within the same series. For example, a 2500 double-bellow bag can often be swapped for a 2503 triple-bellow bag in a kit designed for that series, but you cannot simply fit a 2600 or 2400 into 2500 brackets. The bracket diameter, bolt pattern and clearances are all designed around a specific series.

Boss airbags typically have a recommended working range of around 5–160 psi, with a recommended test pressure of about three times the maximum working pressure and burst testing well above that. Always refer to the specific bag’s data and never exceed the recommended working pressure in normal use.

Replacement airbags must be installed on the correct brackets with the correct beadlock rings or hardware as designed for that kit. Ensure there is adequate clearance from tyres, exhausts, sharp edges and moving suspension parts, and maintain minimum pressure so the bag does not fold or pinch under full compression or articulation.

The 4500 DOUBLE BAG is designed to accommodate standard height vehicles and can support lifts of up to approximately 2 inches. For lifts exceeding this height, consider using taller brackets or triple-bellow bags for optimal performance.

The 4500 DOUBLE BAG features a larger double-bellow design compared to the 2400, 2500, and 2600 series airbags, providing enhanced load-bearing capacity and stability. This makes it particularly effective for heavier loads and demanding applications.

Yes, the 4500 DOUBLE BAG is an excellent choice for towing as it helps stabilise the vehicle and maintain a level ride height, ensuring better control and safety while towing heavy loads.

Regular maintenance includes checking for air leaks, ensuring proper inflation, and periodically draining moisture from the air system. Inspect the bags for any signs of wear or damage to maintain optimal performance.