Holder Activated AVS System Holder Activated AVS System Air Powered Oral Evacuation Requires 50 PSI Minimum to Operate 1 Quart Plastic Collection Bottle Mounts to Underside of Dental Unit or Cabinet Precision Comfort® HVE & Traditional Tubing Precision Comfort Extended HVE 5112 6' of Smooth Vacuum Tubing 733 Activated by holder & air switch