The inner bladder of the lungs contains the gas you breathe through the loop. The outer lung is there to protect the inner lung and is made with a reinforced tough nylon material. The lungs are fitted with a big D-ring in the bottom of each lung, where you can attach bailout tanks, lights, SMBs or anything else that may come in handy during your dive. The inhalation counter lung has a Velcro strap fitted on the side where you can attach your inflator hose. The exhalation lung has an Over Pressure Valve fitted on the lower part of the lung.
The Tech Counter Lungs can also be used when diving recreationally, by replacing the two injection buttons with blind plugs. This is great for divers who find that normal recreational counter lungs don’t have enough volume. When diving a technical version of the Poseidon rebreather, you may need to add oxygen and/or diluent gas manually into the loop. We have two separate intakes for these two gases. The injection for oxygen is on the exhalation lung. The diluent air inflation is on the inhalation lung. Both buttons are clearly marked so you don't fit the hoses in the wrong manner.