The Air Spring Isolator BiAir® consists of either a steel or cast aluminum body whose air volume is enclosed by a thin-walled, flexible and pressure-resistant rolling diaphragm. The piston is seated on this diaphragm & is pushed into the air volume.

This design causes highly effective vibration isolation. In order to obtain as high a dampening effect as possible, the air space is split into two chambers (load and dampening volume) that are connected by an air tube. The amount of dampening can be easily changed by the adjustable valve located on the outside of the air spring. As the load on the air spring changes, air is forced through the bypass valve creating friction. This friction creates up to an 18% dampening effect. Additional safety valves protect the rolling diaphragm from getting damaged by over inflation.