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Demonstration Video:
Video: Hollis DC4 212 and 221 Balanced Regulators Video Review

Mfg Part Number :
240.3451.07

Hollis 221 DC-4 Balanced Regulator, DIN

Customer reviews see below

 



  • For cylinders fitted with a DIN valve only (for cylinders fitted with a standard yoke valve order adapter below)
  • Nitrox compatible to 40% (the recreational limits of nitrox)
  • Over-balanced first stage achieves superior performance by increasing your air flow the deeper you go
  • Designed for extreme depths and cold water
  • Pneumatically balanced second stage 
  • Orthodontic mouthpiece to alleviate jaw fatigue by easing bite needed to hold regulator
  • "Diver Adjustable" venturi to prevent unwanted free-flow
  • FULL MANUFACTURER’S WARRANTY
 Regulator Only


  

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