Precision Comfort® Conversion Q.D. Swivels A-dec® HVE Q.D. Swivel Precision Comfort Q.D. Swivels allow proper fit in other equipment manufacturers' holders & tubing A-dec® is a registered trademark of A-dec, Inc. DCI has no affiliation with A-dec and A-dec has not authorized DCI replacement parts to be used on or in connection with A-dec® products.