The MK25/S600 regulator has become synonymous with SCUBAPRO quality and unbeatable engineering. It combines the best-selling air-balanced second stage with the top-performing air-balanced piston first stage for flawless performance and ease of breathing. SCUBAPRO offers four different models, each with its own specific features and benefits. The Titanium is specially designed for ultra-lightweight portability, and the Black Tech model delivers scratch- and corrosion-resistant protection. All models offer instant and constant delivery of ultra-high airflow for incomparable performance in all conditions.