Huntleigh Flowtron Hydroven 3 Full Leg Garment has three chambers that provide a pressure gradient with a 10% reduction in pressure from the bottom to the top. This product can be used with Hydroven Inserts and has a snap-lock for easy set up. It is compatible with Hydroven Flowtron 3 Pump and older Huntleigh pump models Flowtron HC (AC200) and Flowplus (AC330.)