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Breathing Loop

consist of the robust Canister made of a marine grade hard anodized aluminum with 
teflon coating or optionally made of Delrin.

Back-Mounted Counterlungs

The XCCR is standardly equipped with Back-mounted 
Counterlungs made as the separated inhalation and 
exhalation counterlungs connected all in one piece by a 
central support plate.

The Counterlungs are made of a double layer. 
The Outer shell is made of Cordura fabric, protects the 
inner bladder and bears all fasteners. The outer shell is 
equipped with D-rings for attaching divers’s accessories 
and with Velcro straps on the side for attaching the LP 
hoses leading from the manifold. 

The Inner bladders are gas-tight bags made of soft 
Cordura with PU coating and are accessible through 
zippers at the middle of the outer shell.

The Counterlungs are equipped with the trapezoidal 
threaded fitting for connecting the T-pieces providing 
connection to the breathing loop

The exhalation counterlung is equipped with the 
adjustable Over pressure / dump valve allowing easy 
to drain eventual water. The over pressure / dump valve 
can be operated manually by pulling the string. The over 
pressure / dump valve can be tighten to allow the 
positive pressure test of the loop, while during the dive it 
has to be in the open position ensuring maximum 
overpressure in the breathing loop less than 40 mbar.

The Counterlungs can be easily removed for cleaning, 
disinfection, drying or storing

The XCCR can be optionally equipped 
with the Front-mounted Counterlungs
configured as the top of the shoulders 

The Front Mounted Counterlungs are equipped 
with inflating valves for direct manual adding of 
oxygen or diluent into the loop.

The inflating valves may rotate the full 360° range.


The low-pro f led T-pieces are used to connect the breathing hoses to the Counterlungs.

The T-pieces are made of Delrin and are connected to the Counterlungs via a socket and 
fastened by a nut with trapezoidal thread resistant to damage. T-pieces attached to the 
Counterlungs may still rotate the full 360° range.

The Inhalation T-piece has integrated ADV 
(Automatic Diluent Valve) and LP inlet connected to the 
Diluent Manual Adding Valve.


The ADV – automatic diluent valve is integrated into the 
inhalation T-piece.

The ADV is designed in a similar way like a 2nd stage 
regulator. It is activated by a negative pressure in the 
breathing loop and automatically adds diluent to the 
breathing loop when needed.

The ADV is standardly equipped with the Shut-off valve that can shuts off diluent from the 
connected LP hose. The Shut-off valve is operated by sliding the black switching ring up 
or down. It is useful in the event when if the diver wants to have the adding of diluent 
under his full control or in case of malfunction of the ADV if that would happened

The Exhalation T-piece has integrated LP 
inlet connected to the Oxygen Manual Adding 
Valve and an integrated inner rib acting as a 
water trap that directs the breathing gas 
directly into the exhalation Counterlung, 
where eventual water can be easily drained 
out through the Over pressure / dump valve 

MAVs – manual adding valves

For adding diluent or oxygen into the loop, the Counterlungs 
are equipped with standalone manual adding valves (MAVs), 
connected via a LP hose leading from the appropriate 
manifold to the lateral inlet on the T-pieces at the 

The MAVs are made of Delrin with a metal button valve and 
connecting fittings. The button for oxygen adding is marked 
by a small nipple, while the button for diluent adding is 
marked by a dent.


The MAVs have additional connecting port for optional 
connecting off-board gases via QC6 quick-connect coupler.

BOV Shrimp – Bail-Out Valve (BOV)

BOV Shrimp a Bail-out Valve with a 2nd stage regulator incorporated into the mouthpiece 
with the ability of supplying the diver with open circuit breathing gas when needed.

The BOV Shrimp is a standard part of the XCCR loop.

The CC/OC valve allows to easily and fast switch between the close circuit (the CC mode) 
and the open circuit (OC mode) by one hand. It is operated by rotating the knob on the 
front of the BOV.

When the BOV is switched to the CC mode – the breathing loop is open via the 
mouthpiece and allows the diver to breathe on the rebreather closed circuit.

When the BOV is switched to the OC mode – the breathing loop is closed and allows the 
diver to breathe on open circuit via the 2nd stage regulator. In this position no water can 
enter the breathing loop even when the BOV is out of the diver’s mouth and submerged.

The 2nd stage regulator has an adjusting knobt 
allowing to adjust optimal breathing resistance.


One-way directional valves (mushroom valves) 
provide and ensure the correct breathing gas 
circulation in the breathing loop in the correct 
direction from left to right, from the inhalation 
counterlung to the exhalation counterlung.

Breathing hoses are connected to the BOV via the unique and secure Click-Lock 
Bayonet Connectors. There is impossible to connect the breathing hoses incorrectly due 
to different keying on each bayonet connector on the loop.

The BOV 2nd stage regulator is connected via the diluent manifold to the diluent cylinder 
as well as can be optionally connected to an off-board bailout cylinder.