Best in class and in mint condition: Manual Vacuum ED Therapy System. Manually operated pump head, quiet precision vacuum, easy one-handed squeeze operation, fits comfortably in the hand. Check manufacturer site for specs and instructions. System Components: Manual pump head with w/ safety release valve. cylinder. 4 Osbon tension rings. ring loader. 2 inserts. 4 oz lubricant. zippered case. Cylinder size: 2″ diameter and 8.5″ length