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The EE Difference
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Gear & Advice You Can Trust


Air balanced technology for high breathing performance, yet simple to operate for fun and relaxation on every dive. Initiates air flow effortlessly and instantly on demand. Remarkably durable and reliable, compact and lightweight.

Air-balanced valve technology. The air-balanced valve technology of SCUBAPRO’s second stages features a balancing chamber in the second stage mechanism, slightly offsetting the force of the downstream air entering from the first stage. This allows reduced spring tension and decreases the inhalation resistance to the lowest possible level. The result is super smooth breathing in all conditions. The air-balanced valve technology is featured in the X and S-Series second stages. For best results they should be combined with balanced first stages, like the MK25 or MK17.

Venturi Initiated Vacuum Assist (VIVA). Another SCUBAPRO patented feature, the VIVA is available on all SCUBAPRO second stages. VIVA uses the power of a vacuum assist to reduce work of breathing and increase breathing comfort. It is diver adjustable on all current SCUBAPRO second stages except the R295, since it is a second stage intentionally designed for diver training courses, rental facilities, and divers demanding ready to use equipment. A VIVA in MAX position gives powerful breathing support on every single breath; a VIVA in MIN position helps to prevent free flow on the surface, for training, for buddy breathing, in currents, or when used as an octopus.

Orthodontic mouthpiece. SCUBAPRO uses a comfortable orthodontic mouthpiece on every second stage to reduce jaw fatigue and gum irritation. It was developed by dentists and dental laboratories and lasts longer than any other mouthpiece, because only a minimum effort is needed to hold it comfortably in place.

Precision moulded carbon fiber & technopolymer housing: low friction, light weight, corrosion and cold water resistant for long life & sturdiness.

S555 Second Stage

  • Air balanced valve technology: Yes
  • Classic downstream valve: No
  • Precision molded carbon fiber and technopolymer housing : Yes
  • Titanium components: No
  • Nitrox compatible up to 100% oxygen concentration: No
  • Divers adjustable inhalation effort: No
  • Divers adjustable VIVA (Venturi Initiated Vacuum Assist): Yes
  • Pre-tuned system: No
  • Sturdy super-flow hose with kevlar lining for extra durability and flawless air delivery: Yes
  • High comfort orthodontic mouth piece: Yes
  • Super high flow: No
  • High flow: Yes
  • Left and right attachment for extra convenience: No