This is the XS Scuba Brawn 2nd Stage Complete Scuba Diving Regulator Features:Second Stage: Pneumatically balanced downstream design Adjustable dive/predive venturi lever Flexible, easy purge cover for quick clearing Chambered exhaust tee directs bubbles away from your face The Brawn regulator combines performance, reliability and economy in one package. Designed to take the high-use demands of a rental department without the need for constant adjusting. Factory cleaned and ready for pre-blended Nitrox up to 40% oxygen.