Spirotechnique – Mistral #9555

The Spirotechnique Royal Mistral is a classic twin-hose scuba diving regulator known for its durability and long production run. Here’s some information about this iconic regulator:

Spirotechnique Royal Mistral: The Spirotechnique Royal Mistral is a twin-hose regulator, which means it has two separate hoses, one for inhalation and one for exhalation, leading to a mouthpiece at the end of each hose. This design was common in vintage regulators and was widely used by divers during its heyday.

Key Features:

  1. Durability: The Royal Mistral is known for its robust construction and durability. It was designed to withstand the rigors of underwater diving and has a reputation for longevity.
  2. Pressure Gauge Port: Unlike the original Mistral, the Royal Mistral features a port for attaching a pressure gauge. This allows divers to monitor their tank pressure during a dive, providing valuable information for dive planning and safety.
  3. Aquastop Valves: The addition of non-return valves, often referred to as “Aquastop” valves, in the mouthpiece helps make clearing water from the hoses easier. These valves prevent water from entering the regulator when the diver exhales, reducing the need for frequent clearing.
  4. Reduced Dead-Space: The incorporation of Aquastop valves also reduces dead-space within the regulator. Dead-space is the volume of air in the regulator that does not contribute to breathing and can cause inefficiencies. Reducing dead-space improves breathing comfort.
  5. Long Production Run: The Spirotechnique Royal Mistral had a longer production run compared to its predecessor, the original Mistral. It remained in the Spirotechnique catalog for many years, reflecting its popularity and reliability.

Historical Significance: The Spirotechnique Royal Mistral holds historical significance in the world of scuba diving, particularly among collectors and enthusiasts of vintage diving equipment. It represents an era when twin-hose regulators were widely used by recreational and professional divers.

Collector’s Item: Vintage Spirotechnique Royal Mistrals are sought after by collectors due to their historical importance and unique design. Well-preserved examples can be valuable additions to diving memorabilia collections.

Keep in mind that if you plan to use a vintage Spirotechnique Royal Mistral for diving, it’s essential to have it inspected and serviced by a qualified technician to ensure its safety and functionality. Vintage equipment may not meet modern safety standards, so caution should be exercised when using it for actual diving activities.

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