I. Back Mounted Counter Lungs - Inhalation/Exhalation (right/left)

MX Rebreather - Back Mounted Counter Lungs - Inhalation/Exhalation (right/left)

As with our UTD/DIR OC configuration, we do not like the front of our bodies inhibited or cluttered, therefore we prefer to mount our inhalation and exhalation counter lungs behind our shoulders, between the shoulder and the diluent/bailout tank and frame. With the exploration frame, there is sufficient space for both the BCD air pontoons, which rise while in prone position, and the counter lung.

Each of the counter lung pontoons are intentionally kept as small as possible, (3L each) to reduce potential problems caused by large, over inflated counter lungs. Each of the counter lungs has an anti collapse system built in to prevent collapse while on the surface. The position of the counter lungs provides an excellent very low work of breathing in all positions due to the almost equal plane the lungs are on. Due to their length over the body and lungs, they also do not affect your buoyancy or trim as much lungs that might be positioned higher or lower on the diver.

Keep in mind that a diver in the prone position has center of gravity right around the naval area and that creates an “arm” of the seesaw on either side of the center of gravity. The further out on the arm from the center of gravity the counter lung is placed, the more the change in buoyancy of that counter lung will affect your trim as well as your buoyancy. The closer to the center of gravity the less it will affect you. The inhalation lung is worn on the right side and the exhalation on the left. The exhalation also has the over-pressure relief valve (OPV) built in. The counter lungs are attached to your harness with quick disconnects and therefore can easily and quickly be removed for cleaning after diving.