P/N AMMV-AM-01 (front unit)

P/N JMU-BC-06 (back unit)


Professional oxygen closed and nitrox semiclosed circuit breathing


CAIMANO MK4 CSC PRO is a combined oxygen closed circuit and Nitrox semi-closed circuit rebreather. It is a high performing, simple and robust apparatus, designed for intensive use.


  • Closed circuit oxygen front unit and semi-closed nitrox back unit.
  • Extremely compact for low water resistance while swimming.
  • Innovative radial type soda lime filter designed for large capacity and optimal absorption.
  • The soft shield Cordura® material protects the breathing bag against tearing and abrasion.
  • Hydrodynamic fitness ratio.
  • Oxygen front unit: automatic (on-demand valve) and/or manual (by-pass) oxygen injection control.
  • Nitrox back unit: three different flow nozzles available for different nitrox mixture (others on request)
  • Possibility to switch from oxygen closed circuit to nitrox semiclosed circuit during the dive
  • Automtic mode allows diver “free-hand” operational
  • No tools required for setup and operation


  • Max operational depth oxygen: Diving rules in your Country
  • Max operational depth nitrox: See duration / depth table aside
  • Dive time oxygen: ~240 min @ 20°C (68°F) 1.25 l/min of oxygen consumption
  • Storage temperature:  -30°C ÷ 70°C  (-22°F ÷ 158°F)
  • Operative temperature: -2°C ÷ 40°C (28°F ÷ 104°F)
  • Breathing bag capacity: Variable volume, ~ 8.5 lt (0.3 ft³)
  • Radial filter capacity:  ~2.2 Kg  (4.85 lb) of soda lime
  • Oxygen Cylinder capacity: 1 x 1.5 liters 232 bar (3364 psi)
  • Nitrox Cylinder capacity: 2 x 1.5 liters 232 bar (3364 psi)
  • Max buoyancy nitrox unit: 30 liters (8 gallons) max.
  • Dim. Front unit (HxWxD): 420 x 350 x 110 mm / 16.54 x 13.78 x 4.33 inch
  • Weight in air (front + back): 11.8 Kg (26lb) front unit, 23.5 Kg (51.8lb) total with 2x1.5lt back unit with BC
  • Weight in sea water (front): Neutral with 2.5 l of oxygen in the bag
  • Weight in sea water (back): Neutral by BC

For more informations please contact us on

SIEL S.r.l.
Torino Plant: via Postiglione 24, 10024, Moncalieri (TO) - Italy
Spezia Plant: via Vincinella 14, 19037, S. Stefano di Magra (SP) - Italy
VAT registration number: 04201240019