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Designed with the serious sport diver in mind, the R190 combines a time-tested, fourth-generation downstream design with rugged construction and dependability. Classic Downstream Valve Diver-Adjustable VIVA (Venturi Initiated Vacuum Assist) Diver can adjust for optimal airflow. Anti-Set Design Purge button feature helps ensure longer seat life and more consistent performance. Reversible LP Hose Attachment for custom regulator configurations.