Professional oxygen closed circuit rebreather

CAIMANO MK4 CDV PRO is a new generation of shallow water Closed Circuit Underwater Breathing Apparatus (CCUBA). It is conceived, designed and manufactured by SIEL in order to meet all needs of professional divers.


  • Closed circuit oxygen rebreather, ventral soft shield apparatus.
  • Weight and dimensions highly reduced compared to other same class rebreathers.
  • Easy and quick to wear.
  • The soft shield Cordura® material protects the breathing bag against tearing and abrasions.
  • Hydrodynamic fitness ratio.
  • Innovative radial type soda lime filter designed for large capacity and optimal absorption.
  • Automatic (on-demand valve) and manual (by-pass) oxygen injection control.
  • Automatic mode allows diver “free-hand” operations.
  • No tools required for setup and operation.


  • Max operational depth: More than 12 mt (39 fsw)
  • Real operational depth: Diving rules in your Country
  • Dive time: ~240 min
  • Storage temperature: -30°C ÷ 70°C  (-22°F ÷ 158°F)
  • Operative temperature: -2°C ÷ 35°C (28°F ÷ 95°F)
  • Breathing bag capacity: Variable volume, ~ 8.5 lt (0.3 ft³)
  • Radial filter capacity: ~2.050 Kg (4,52 lb) of soda lime
  • Cylinder capacity: 1 x 1.5 liters 232 bar (3364 psi)
  • Dimensions (HxWxD): h420 x w350 x d140 (16.53x13.77x5.51 inch)
  • Weight in air: 8,4 Kg (18,52 lb) w/out soda lime
  • Weight in sea water: Neutral with 2.5 l of oxygen in the bag

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