ACCESSORIESHD SAS Rear Air Ride Suspension For HARLEY DAVIDSON and Custom Softails 2000 TO PRESENT Built in compressor,Cylinder Pistons and Rods are doubled sealed,Pre set dampening,Easiest install on the market (no compressor to mount), Only 4 switch wires and 4 bolts and the remote air breather to complete the install,Allows the full 4" of swing arm travel,Quick connect fitting with improved convenient breather line,No air lines to deal with or leak,The pneumatic cylinders eliminate bottoming out,All mechanical functions are protected in the durable CNC billet machined body,Remote filtered air breather keeps compressor clean and dry,All parts are CNC machined billet aluminum,The main body is hard anodized and warranted for life Moving parts are oil-impregnated (permanent lubrication),All parts are completely and easily re-buildable,