Offering effortless air delivery and outstanding reliability, this is the go-to air delivery system for cold water or technical diving. There’s no better example of solid first stage performance in all water temperatures than the MK25 EVO. Teamed with the venerable G260, this system can be relied upon to deliver top-of-the-line performance in the most extreme conditions. The MK25 EVO delivers an ultra-fast breathing response, great sensitivity and extra-high airflow, making it the ultimate do-it-all first stage for all water temperatures. The G260 is the most imitated air-balanced second stage of all time. It features metal internal components and a left-right hose attachment option, making it a great choice for tech diving configurations and a consistent top-of-the-line performer.