Scuba Diving - Aqualung Legend ACD Supreme


Aqualung Legend ACD Supreme




The Aqualung Legend ACD Supreme regulator is lauded as being one the best performing regulators that Aqualung has designed: according to Aqualung it is lengendary… hence its name!

Why do Aqualung claim that the Legend ACD Supreme is so good? Are their claims about it justified? And what exactly are the stand out features?

Features of the Aqualung Legend ACD Supreme

The Aqualung Legend regulator includes the following specifications:

  • ACD stands for “Auto Closure Device”. The Legend’s ACD keeps the inlet fitting of the regulator sealed (DIN and Yoke) whenever the regulator device itself is removed from your air tank. This means several things:
    • Water and other contaminants cannot enter the first stage. As a result, the first stage itself will retain its level of performance over time and makes it safer to use with Nitrox.
    • The sealed dry chamber also provides resistance to freezing, keeping the mechanics of the Aqualung Legend regulator both clean as well as dry.
  • The second stage is pneumatically balanced to ensure consistently easy inhalation regardless of tank pressure.
  • The Aqualung Legend ACD Supreme also comprises Venturi Adjustment Switch technology (VAS - controlable by the diver). The VAS prevents free-flowing air when you are at the surface but allows maximum flow beneath it.
  • The Legend ACD Supreme also includes Aqua Lung’s Air Turbo System technology in its forward pressure ports which further enhances the breathing capabilities of the regulator.
  • The Legend’s over-balanced diaphragm first stage design also improves breathing performance at depth.
  • The Legend ACD Supreme regulator is coated with a polyurethane layer which protects its water facing metal parts from corrosion.
  • It has 4 x low pressure and 2 x high pressure ports, which are positioned for the best possible configuration of your hoses.
  • Recommended for cold water use below 10º C (50º F): the Legend ACD Supreme passes CE standards for cold water regulator performance.
  • A removable lip shield on the second stage provides cold protection to your lips.
  • 2 year manufacturer warranty.

Aqualung Legend ACD Supreme Review Summary

The Aqualung Legend ACD Supreme is a cold water verison of the Aqualung Legend ACD and is a very reliable regulator largely due to its ACD technology.

Aqualung Legend ACD SupremeThe sealed first stage completely protects it from contaminants (when removed from the cylinder valve) in any environment. So cleaning and transporting this particular Legend model should not result in contaminant damage and any subsequent performance degradation over time. The ACD also means that the Legend ACD Supreme is highly suitable for Nitrox diving.

Further features are an overbalanced first stage diaphragm combined with a pneumatically balanced second stage. These features enhance air supply as you descend at the same time as reducing breathing resistance making it easy to inhale. As the second stage is pneumatically balanced it does not require any form of adjustment from you.

The second stage is small and lightweight and can be combined with a number of supplied mouthpiece fittings: an ultra-comfortable model, a standard spare and a reusable clamp.

A lip shield can be used to help keep your lips warm in colder waters, for which the Aqualung Legend ACD Supreme is extremely well suited.

The Aqualung Legend ACD Supreme is a reliable and easy to use regulator that performs well in both warm and cold water.

Rating: ★★★☆☆


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