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.First Stage: Lightweight and compact Flow-by piston design Rental tough 4 medium pressure ports 1 high pressure port 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 Limited Lifetime Warranty - See owner&';s manual for details