The air bellows is an alternative construction between the box and the bracket. The advantage of the air bellows is that it makes it incredibly easy to remove and fold away the box, and make enough room between the feederroller and driverwheel to mount snow chains.

You just lift the handle and box will glide away from the wheel. When you done using chains, press on the electric switch and the SLIREJ gravelspreader goes against the wheel, the handle will fall down and resumes the default position.

Brochure for SLIREJ with airbellow you can download here