ScubaPro R295 Scuba Regulator Package Package Includes: ScubaPro MK2 Plus R295 Regulator | ScubaPro R095 Octopus | Regulator Bag Classic downstream valve. Classic downstream valves are particularly noted for their legendary safety and reliability. When in use, the downstream valve opens in the same direction as the incoming air flow. To close the valve and stop the air flow, a spring counteracts the force of the incoming air. Therefore, a certain inhalation effort is always required to overcome the spring tension and open the valve Fixed VIVA (Venturi Initiated Vacuum Assist) flow vane. Fixed in the pre-tuned ideal position for safe and uncomplicated use Extremely lightweight and compact. Comfortable for all divers, including novice divers newly initiated in the sport. Orthodontic mouthpiece. SCUBAPRO uses a comfortable orthodontic mouthpiece on every second stage to reduce jaw fatigue and gum irritation. It was developed by dentists and dental laboratories and lasts longer than any other mouthpiece, because only a minimum effort is needed to hold it comfortably in place.