Hello Rick, Thank you for your inquiry! The Atomic Universal Comfort Swivel fits most second stages with standard 9/16-18 hose connection. It is also Nitrox compatible to 40% (The recreational limits of Nitrox). http://www.scuba.com/scuba-gear-37/034511/Atomic-Universal-Comfort-Swivel-Hose.html
If you have any questions or wish to place an order, please call us at 1-800-247-2822 or 949-221-9300.