The MK11 EVO/C370 is a compact, dependable air-delivery system that makes diving fun wherever your travels take you. The new balanced diaphragm MK11 EVO features an innovative double-spring layout, a forged brass body with thermal fins, and protective plastic bumpers to ward off scratches. The compact C370 offers convenient user controls, including a diver-adjustable inhalation effort knob, a coaxial dive/pre-dive lever and a large, easy-to-activate purge button.