Kirby Morgan Diamond Helmet

  • Helmet Pad
  • QD Whip, 42″, Brass
  • QD Whip, 42″, Stainless Steel Double Shut-Off


The Kirby Morgan® Diamond Is The Next Modular Variation To The KMDSI Stainless Steel Helmet. When The KM Diamond Is Attached To Our Stainless Steel Helmet Shell The Diver Can Operate In Either A Surface Exhaust Or Ambient Water Exhaust Diving Mode.

Before the diver enters the water, with a simple two-step process, they have the opportunity to switch the helmet into surface vent mode where their exhaled gas is sent to the surface and not into the surrounding water where they are working. On the surface the exhaled gas can be sent to a reclaim system or simply secured on an open deck to vent into the atmosphere. The KM Diamond can be also operated in the open circuit mode for the entire dive.

The advantages of this stainless steel helmet include the following:

– Rugged helmet shell and other components
– No refinishing required if the surface is scratched or gouged
– Elimination of threaded inserts for securing port retainer to helmet shell

Air Train - The air train diffuses incoming breathing air/gas onto the face port/lens to defog and ventilate.
Bypass Equalizer Tube - This system stabilizes the supply regulator, creates a protective bubble layer to the exposed valve and deflects exhaust bubbles from the diver's field of view when operating in open circuit mode.
Defogging Steady Flow Valve - Provides an additional flow of gas into the helmet for ventilation and defogging.
Diamond Exhaust Assembly - Two-stage regulator that controls and routes the exhaled gas. Rapid removal and replacement is possible with clear access to all fasteners.
Emergency (EGS) Valve - Supplies backup breathing gas to the diver. This valve is an integral built-in part of the stainless steel sideblock.
Gas Supply Non-Return Valve - Commercial Rated™, It prevents loss of gas pressure in the event of umbilical damage.
Handle - Removable Grip and Handle. Handle can be removed without breaking seals, making it quick and easy to attach accessories.
Nose Block Device - Allows the diver to block the nose to equalize ears.
Overpressure Relief Valve - Automatically activates if internal helmet pressure becomes too great. Can also be manually adjusted to improve breathing when operating in the open circuit mode or it can act as a standalone feature to dump exhaled gas directly into the surrounding water.
Rapid Change Modular Communications Systems - Because the module is easily removed the helmet, repair or replacement of communications parts is quick and trouble free. It is available with either a male waterproof connector or a bare wire post connection.
Side Block - Multi use side block has additional ports built in to provide controlled air flow, if needed. The stainless steel sideblock has a built-in EGS.
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. Easily cleaned using a Scotch Brite® or similar type cleaning pad.
Surface Bypass Valve - Effortlessly switch from surface vent, (or reclaim), to standard open circuit diving mode. Switching back and forth from diving modes is instant with a single action.
Water Purge Assembly - Positive shut off valve is spring loaded. Internal pick up tube reduces chance of exposure and increases effectiveness in dewatering the helmet.

Weight - 34.8 lbs
Helmet Shell - Stainless Steel
Control Knobs - Polyurethane
Face Port/Lens - Scratch Resistant Polycarbonate
Neck Dam - Neoprene. Optional latex neck dam available.
O-Rings - Buna-N
Head Cushion - Nylon bag filled with #4 Polyester foam
Recommended Lubricants - Kirby Morgan recommends Christo-Lube® or equivalent for all gas train components. Dow Corning® 111 Silicone or equivalent may be used for this helmet ONLY when noted.
Inhalation Regulator - The Inhalation Body and Pod is one complete unit with the regulator based on the Kirby Morgan 455 Balanced Regulator.
CR Standards - This helmet meet or exceed all standards established by Dive Lab of Panama City, Florida, and are CR (Commercially Rated) marked.


The minimum operating temperature recommended for this helmet is 34°F (1°C) without the use of the water shrouds and hot water.

Without hot water and the shroud system, the diver may be subject to hypothermia due to cold gas inspiration temperatures.

Spare Parts Kits

DSI 525-383 Soft Goods Overhaul Kit
DSI 525-211 Sealed Pull Pin Overhaul Kit (sold to factory trained Tech’s only)
DSI 525-313 Side Block Kit
DSI 525-330 One Way Valve Kit
DSI 525-628 KM Diamond Tool Kit


DSI 515-023 Comms Ass'y w/Post
DSI 515-024 Comms Ass'y w/WPC
DSI 515-033 Comms Set (Mic & Earphones Only)
DSI 515-029 Microphone Ass’y

Neck Dams

DSI 510-631 Latex Neck Dam, Sm-Med
DSI 510-633 Latex Neck Dam, Med-Lrg
DSI 510-689 Latex Neck Dam, XL
DSI 510-627 Neoprene Neck Dam, Small
DSI 510-628 Neoprene Neck Dam, Med
DSI 510-629 Neoprene Neck Dam, Large
DSI 510-688 Neoprene Neck Dam, X-Large
DSI 510-674 Cold Water Neck Dam, Small
DSI 510-675 Cold Water Neck Dam, Medium
DSI 510-676 Cold Water Neck Dam, Large

Neck Rings Ass’y

DSI 505-744 Neck Ring Ass’y, Latex, Sm-Med
DSI 510-633/DSI 525-230 Neck Ring Ass'y, Latex, Med-Lrg
DSI 505-745 Neck Ring Ass’y, Neoprene, Small
DSI 505-746 Neck Ring Ass’y, Neoprene, Med
DSI 505-747 Neck Ring Ass’y, Neoprene, Lrg
DSI 505-749 Neck Ring Ass’y, Neoprene, X-Large
DSI 525-230 Dry Suit Neck Ring Kit

Head Cushions

DSI 510-754 Head Cushion (replaced pt# DSI 510-682)
DSI 510-683 Chin Cushion
DSI 510-672 Replacement Foam Kit (for DSI 510-682 & DSI 510-683)
DSI 525-745 Head Cushion Foam Spacer Kit (for DSI 510-682 & DSI 510-521)
DSI 525-746 Head Cushion Foam Kit (for DSI 510-683 & DSI 510-754)


DSI 525-375 Zinc Anode Kit
DE 255-020 Bail-Out QD Whip, 42”, Brass (Single Shut-off)
DE 255-020DD Bail-Out QD Whip, 42”, Brass (Double Shut-off)
DE 255-025 Bail-Out QD Whip, 42”, S/S (Double Shut-off)
DSI 525-112 Pull Pin Sleeve
DSI 525-403 Weld Lens Ass’y (lens not included)
DSI 525-400 Weld Shield Ass’y (lens not included)
DSI 555-210 Restrictor Adaptor
DSI 525-770 Pull Strap Assembly Kit
DSI 525-116 Front Standoff Kit
DSI 500-901 Helmet Bag (included with purchase of new helmet)
GL WZ239630 Helmet Pad
DSI 125-100 Logbook w/ Pen (included with purchase of new helmet)
DSI 525-640 KM Diamond Retrofit Kit

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