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Halcyon Big Closed-Circuit Diver Alert Marker 18 kg/40 lb

Halcyon  |  SKU: 14.030.041
Refer & Earn

$153.00
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In stock — ships from Irvine, CA

Color: Pink

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Product Information

The Halcyon Big Closed-Circuit DAM is a high-visibility diver alert marker that doubles as redundant buoyancy, standing 1.4 m (4.5 ft) tall when inflated and delivering 18 kg (40 lb) of lift. Its closed-circuit design, integrated over-pressure relief valve and bottom dump let a diver inflate it at depth and send it to the surface under control.

Who it is for

This is a safety and signaling tool for open-water and offshore divers, technical divers and anyone running decompression or drift ascents where a boat needs to see you from a distance. The 18 kg (40 lb) of lift also makes it a redundant buoyancy source in addition to marking your position. Because it deflates and rolls into a thigh pocket or backplate storage, it suits divers who already dive a backplate-and-wing setup and want the marker out of the way until it is needed.

Key details

  • Lift: 18 kg / 40 lb of redundant buoyancy
  • Inflated height: 1.4 m / 4.5 ft for long-range surface visibility
  • Design: closed-circuit, so it holds gas once inflated
  • Pressure control: integrated over-pressure relief valve plus bottom dump
  • Inflation: No-Lock® connector for oral inflate or LP hose connection, and it can be inflated at depth
  • Visibility: Coast Guard-approved SOLAS reflective tape markings

Compatibility and sizing

Deflated, the DAM fits a Halcyon thigh pocket or backplate storage such as the MC Storage Pak. It is offered here in Orange and Pink; Halcyon also lists a yellow option for this model.

DiveCatalog.com is an authorized Halcyon dealer and a real dive shop in Irvine, California since 2003. Call 888-701-4017 or start a chat if you want help choosing a color or confirming it will stow in your pocket or storage pack.

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Frequently Asked Questions

What is the difference between a closed-circuit DAM and an open-bottom SMB?

A closed-circuit DAM holds the gas you put into it rather than relying on an open bottom to trap air. Halcyon's Big Closed-Circuit DAM uses an integrated over-pressure relief valve and a bottom dump to manage that gas, so it can be inflated at depth and vented in a controlled way as it rises. The closed design is why it also works as a redundant buoyancy source rated at 18 kg (40 lb) of lift.

How do you inflate the Halcyon Big Closed-Circuit DAM?

It inflates through a No-Lock connector, which accepts either oral inflation or a low-pressure inflator hose. That means you can fill it from your gas supply at depth before sending it up, or top it off orally at the surface. The integrated over-pressure relief valve handles gas expansion during ascent, and the bottom dump lets you vent it when you are done.

Can the Big Closed-Circuit DAM be used as a backup buoyancy device?

Yes. Halcyon rates it at 18 kg (40 lb) of lift and describes it as providing redundant buoyancy for open-water ascents in addition to surface signaling. That lift figure is the key number to compare against your own rig when you are planning redundancy. If you want help deciding whether 40 lb of lift suits your configuration, call 888-701-4017.

Where does it store when deflated?

Deflated, the Big Closed-Circuit DAM rolls down to fit in a Halcyon thigh pocket or in backplate storage such as the MC Storage Pak. That keeps it stowed and out of the way until you need it. Inflated, it stands 1.4 m (4.5 ft) tall and carries Coast Guard-approved SOLAS reflective tape so it reads clearly from a boat.