Used Scubapro MK11 Evo/C370 Regulator System 1st and 2nd Stage SetThe MK11 C370 is a great choice for dive trekkers. The balanced diaphragm MK11, with its chrome plated brass body specially designed to reduce size and weight, is an ideal travel companion. Its system features internal parts that are sealed from the elements. The new C370 brings forth the best features of its predecessor, the C350, while adding a balanced valve to its design. Its new exhaust tee, based on the S620 Tis design, contributes to a 10%