Kirby Morgan 77

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Product Description


The Kirby Morgan 77 Dive Helmet is a new stainless steel metal dive helmet with a rugged outer shell. It features Kirby’s all stainless version of the REX® regulator, as well as a stainless sideblock, helmet ring, bent tube, handle, and other key components. The Rex Quad Valve® Exhaust System is standard on this helmet.

In the future, there will be different regulator pods available for the KM 77 that will allow the KM 77 to accept other Kirby Morgan regulator assemblies like the SuperFlow 350 and SuperFlow 450.

Removable Grip and Handle: Handle can be removed without breaking seals, making it quick and easy to attach accessories.

Stainless Steel Shell: Each 316 stainless steel shell, is precision CNC machined to tight tolerances, to ensure proper fit to all other mating parts. The shell is durable and easy to maintain.

Defogging Steady Flow Valve: Provides additional flow of gas into the helmet for ventilation and defogging.

Emergency (EGS) Valve: Supplies backup breathing gas to the diver.

Side Block: Multi use side block has additional ports built in to provide controlled air flow, if needed.

Rapid Change Modular Communication System: The module is easily removable. This allows for quick and trouble free repair and replacement. It is available with either a male waterproof connector or a bare wire post connection.

Whiskers: Bubble deflecting whiskers keep bubbles further from your face port and ears improving visibility and decreasing internal noise.

Pull Strap: The strap has been improved with the addition of a stainless steel D-ring. This makes for easier removal. It also allows the assembly to easily be hung for drying.

Positive—Lock™ Latch System: This latching system, developed by Kirby Morgan in 1992, consists of two sealed Positive—Lock™ pull pins which are pulled forward to release the neck collar and neck dam locking system. Even when the latches are released, the O-ring sealed neck dam maintains a positive seal and will not allow the seal to be broken until the collar actually clears the diver’s shoulders, thus helping to prevent any flooding of the helmet.

Head Cushion: Gives the helmet a secure, well balanced feel as well as excellent thermal protection during long work periods.

Adjustable Neck Pad: The helmet attached yoke system has an adjustable neck pad which is made from a scuff resistant elastomer. In conjunction with the spring activated front neck dam ring lock, it provides protection for the bottom of the helmet.

Rex® Demand Valve (patents pending): With its full adjustment balanced piston is a breakthrough design that exceeds all requirements of all government or other testing agencies. It has the best work-of-breathing performance when compared to ANY other commercial diving helmet. This is Kirby’s highest performing regulator, with the lowest breathing resistance and best work of breathing.

Silicone Oral Nasal Mask: Made of superior silicone material which is hypo-allergenic and has a longer work life than latex.

Air Train: Diffuses the incoming breathing air/gas onto the face plate to defog the lens.

Weight: 30.96 pounds

Helmet Shell: Stainless Steel

Control Knobs: Polyurathane

Lens: Clear polycarbonate

Neck Dam: Neoprene (Size Medium). See Accessories tab for other sizes and latex material.

O-Rings: Buna-N

Head Cushion: Nylon bag filled with #4 Polyester foam

Recommended Lubricants: All helmets and masks are lubricated at the factory with Christo Lube. KMDSI recommends Dow Corning 111 Silicone for all non-gas train components.

Regulator Performance

Rex® Performance: The Rex regulator on the Kirby Morgan 77 offers high performance. The regulator has been tested at Dive Lab at Panama City, Florida. It meets or exceeds all current U.S. Navy and European diving standards.

Cage Code: The cage code for identifying KMDSI products for U.S. government purposes is 58366.

CR Standards: These helmets meet or exceeds all standards established by Dive Lab of Panama City, Florida, and are CR (Commercially Rated) marked.

CE Approved: The KM 77 helmet is CE Approved.

The minimum operating temperature recommended for this helmet is 37° F, only in regards to regulator performance. At the time of this writing, no hot water shroud is available for this helmet for heating the diver’s breathing gas.
Without a hot water shroud, the diver may be subject to hypothermia due to cold gas inspiration temperatures. Kirby Morgan makes no physiological recommendations regarding minimum safe operating temperatures for divers using this helmet.
Usually the greatest danger of demand regulator icing will be encountered on deck when the surrounding air temperature is less than 32°F (0°C). This effect is primarily due to the refrigeration effect of breathing air pressure reduction, and the addition of moisture from the divers exhalation coming in contact with the topside air temperature.
Recommended overbottom (OB) gas supply pressure for best performance at depths are calculated by the formula (FSW x 0.445+14.7) + recommended PSIG

Spare Parts Kits


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  • Helmet Type: Steel
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