Harley Softail Air-tail dragger AIS shock pump controller Progressive Suspension ECC Control Unit For Air-Tail, air-dragger frame mount For Softail includes 160lb. Compressor 30-5102 Harley Davidson Softail Air suspension Airtail system PS 30-5102 The revolutionary Air-Tail System from Progressive® is now available to big bike riders, because the folks on Softails® can’t have all the fun! Using the same AirTail® concept, I.A.S. (Integrated Air Shocks) incorporate a coil spring system with a dual chambered air shock for totally independent control of both ride firmness and height. This helps improve handling performance by separating wheel and chassis movement. I.A.S. is the shock for performance and looks!