Cressi MC9-SC / Compact Pro

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The MC9-SC/Compact Pro is designed to be used in cold water, making it versatile to be used anywhere on any trip. It combines a balanced diaphragm 1st stage with a Sealed Chamber (SC) cold water system and a light and compact second stage, which offers high performance in water with...
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The MC9-SC/Compact Pro is designed to be used in cold water, making it versatile to be used anywhere on any trip. It combines a balanced diaphragm 1st stage with a Sealed Chamber (SC) cold water system and a light and compact second stage, which offers high performance in water with temperatures below 10° C | 50 F. The MC9-SC is the 1st stage with a super compensated membrane very modern but, at the same time, easy to maintain and very robust and reliable. The thickness of the body walls has been optimized to minimize its weight. A semi-flexible elastomer sheath protects the 1st stage from bumps and erosions. HP seat in AISI316 stainless steel. Apart from the possibility of replacement in case of deterioration when performing maintenance, the composition of the seat, much harder than the traditional brass of the fixed seats, prolongs its useful life since it better resists the deforming action of the metallic particles that can be introduced coming from the bottle. Polyurethane valve with high mechanical resistance, to oils and to hyperoxic mixtures. The hyper compensation of the mechanism guarantees a slight increase in the intermediate pressure as the pressure in the cylinder decreases. The regulator, therefore, provides its highest level of performance in the final phase of the dive, without a doubt the most critical. An advanced study of the internal air circulation and an exclusive distribution chamber that channels the air volume directly to the LP outlets have allowed pressure drop in forced breaths to a minimum level (0.5 BAR | 7.25 PSI), guaranteeing use with high benefits in any situation. The Seal Chamber is environmentally sealed, protecting it against icing in cold water and against contamination from particulate matter in silty conditions. Especially effective filter in the shape of a hat inserted without the need for a circlip. It features 2 High-Pressure and 4 Low-Pressure ports. INT version weight: 650 g | 22.9 oz. DIN version weight: 510 g | 18 oz. The thread of the DIN version has been made of stainless steel instead of brass to guarantee greater resistance in the event of falls or blows. In order to achieve extremely high performance in low-temperature environments, the Compact Pro 2nd stage, in particular, is designed with the special Thermoconductive Thermoplastic Neopolymer that has the capacity to transfer heat like metal while preserving the design flexibility, chemical resistance, and physical and mechanical properties of a conventional thermoplastic. That is, it makes it possible to drastically reduce the weight while delivering heat conductivity on a par with metal cases. Thanks to this material and a specially conceived safety valve, it can pass all the tests for use in cold water with flying colors. It is compact (6 cm | 2.4 in) and very light (153 g | 5.4 oz) that which makes it ideal for traveling. Service pressure: 232 BAR | 3365 PSI. Calibration pressure: 10 BAR | 145 PSI. Available in both INT and DIN version. Complete INT regulator weight: 943 g | 33.3 oz. Complete DIN regulator weight: 803 g | 28.3 oz.
  • 1st Stage Technical Features
    • Hyper-balanced 1st Stage
    • Environmentally sealed Seal Chamber
    • Light compact structure in chromium-plated brass with inner components in stainless steel, chromium-plated brass, and state-of-the-art thermoplastic resins
    • High-capacity conical filter electroless nickel plated
    • AISI 316 removable nozzle
    • Anti-pressure drop pneumatic spring
    • Semi-flexible elastomer body sheath for bumps and erosion protection
    • 2 High-Pressure 7/16 UNF ports
    • 4 Low-Pressure 3/8 UNF ports
    • Service pressure (INT version): 232 BAR
    • Calibration pressure: 10 BAR | 145 PSI
    • DIN threaded connection EN ISO 1209
    • INT/DIN connection complying with EN 250:2014 standard
  • 2nd Stage Technical Features
    • Downstream system
    • Adjustable venturi effect
    • Thermo conductive technopolymer body
    • Big purge button
    • Anti-scratch surface
    • Bayonet-type cap holder with security lock
    • Stainless steel cover
    • Removable exhaust tee without tools
    • Weight without hose: 153 g | 5.4 oz
  • Combination Performance
    • Average Cracking effort 7.5 mBAR
    • Average breathing effort 1.2 J/l
    • Coldwater certification EN 250:2014
    • Service pressure: 232 BAR | 3365 PSI
    • Calibration pressure: 10 BAR | 145 PSI
    • Complete INT regulator weight: 943 g | 33.3 oz
    • Complete DIN regulator weight: 803 g | 28.3 oz


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We care about your satisfaction. That is why returns to Diving Sports are easy! If you are dissatisfied with your purchase for any reason, you may return it to Diving Sports within 30 days of the purchase date, subject to the conditions and exclusions below.

If all conditions are not met, Diving Sports reserves the right to refuse the return or to charge a minimum 15% restocking fee.

  • All returned items must be in new condition, in their original unaltered box (including an intact PLU code) and must include all packing material, blank warranty cards, manuals and accessories. We can only refund or exchange products that have not been in contact with water or lube and are undamaged. All wetsuits that have been in contact with water or lube will not be accepted for a return.
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Please include the following with your package:

  • All items must be returned in original/unused condition.
  • Unless an item is defective, if you would like an exchange, our standard freight charges apply to send you the exchange, unless you provide a post parcel with your return.
    To return your product, please mail it to: 4578 Main Street, Vancouver BC V5V 3R5 or return the items to our shop in person.
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