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.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.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.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.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.