Ocean Reef Neptune III IDM - Diving Full Face Mask w/ int 2nd st, surface air valve, doffing handle, extender kit and multitool
In stock — ships from Irvine, CA
This item is currently on backorder. Order now to reserve yours, and we will ship it as soon as it is back in stock.
Ocean Reef Neptune III IDM - Diving Full Face Mask w/ int 2nd st, surface air valve, doffing handle, extender kit and multitool - Blue / S/M (Small / Medium) is backordered and will ship as soon as it is back in stock.
Pickup currently unavailable at In Store
Ocean Reef integrated dive mask sizing. Imperial in bold, metric underneath.
| Size | Nose bridge to chin in · cm |
|---|---|
| S/M |
3.9–4.5 10–11.5 |
| M/L |
>4.5 >11.5 |
How Ocean Reef measures
It is essential to choose a suitable size. You can choose between size S/M (for adults with smaller faces, women and children over 12 years old) and size M/L (for an adult male, or larger faces).
- Nose bridge to chin: Measure the distance between the bridge at the top of your nose and the bottom of your chin.
- Try-on: There are two different size categories on the chart: Small/Medium and Medium/Large. If the measurements fall within the both ranges, then the diver should technically be able to wear either full face mask (M/L or S/M), and in that case should try on a mask to select the best fit. Once the mask is tight on your face, if there is NO SPACE between your chin and the silicone skirt of the mask, you've got the right size.
Source: Ocean Reef’s size chart (original chart). Values in the second unit come from Ocean Reef’s own chart where it prints them.
Ocean Reef Neptune III IDM - Diving Full Face Mask w/ int 2nd st, surface air valve, doffing handle, extender kit and multitool - Blue / S/M (Small / Medium) is backordered and will ship as soon as it is back in stock.
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Product Information
The Ocean Reef Neptune III IDM is a full face diving mask with a vertical, body-balanced second stage integrated directly into the mask, so divers breathe naturally through both nose and mouth with no mouthpiece and no jaw fatigue. It is certified to -61 m / -200 ft, suitable for water temperatures below 10°C, and is offered in Black, White or Blue in S/M and M/L sizing.
Who it is for
This mask suits recreational, technical and working divers who want a sealed full face system: cold water divers, divers who need to talk underwater, instructors, and anyone who finds a conventional mouthpiece tiring on long dives. The Extender Kit lets you mount cameras, lights or communication accessories, and the Quick-Detach System allows the second stage to be removed for maintenance or swapping (Level 1 technician certification required).
Key details
- Patented air-circulation system that prevents fogging and flooding of the visor
- Polycarbonate visor coated on both sides with siloxane resin, plus a silicone shock-absorbing deflector
- Silicone face seal with a patented bellows double-S spring profile and a redesigned silicone oral-nasal pocket with dual one-way valves
- Six-strap harness with a fast rotating buckle system and one-handed doffing
- Purge button, surface air valve and dive/pre-dive (Venturi) lever
- 3D equalization system with a patented internal nasal closure device, adjustable in three directions
- STANAG 4296 impact tested with a steel ball at 540 kph; CE marked, EN 250:2014A compliant Category III PPE
Compatibility and sizing
Choose S/M for a nose-to-chin measurement of 10 to 11.5 cm and M/L for 11.5 cm and above. The mask is ready for underwater communication systems, and each component carries a unique serial number for traceability.
What's in the box
- Neptune III Integrated Diving Mask with integrated second stage
- Neptune III Backpack
- Doffing Handle
- Surface Air Valve
- Standard Hose
- Extender Kit / Extender Frame accessories
- Multitool
- QRS (Quick Removal System)
- Warranty registration and stickers
DiveCatalog.com is an authorized Ocean Reef dealer and a real dive shop in Irvine, California since 2003. Call 888-701-4017 or start a chat if you want help choosing between S/M and M/L or confirming accessory compatibility.
- Integrated second stage Vertical, body-balanced regulator built into the mask for natural breathing through nose and mouth, with no mouthpiece and no jaw fatigue.
- Anti-fog air circulation Patented air-circulation system prevents fogging and flooding of the visor.
- Panoramic polycarbonate visor Double-coated with siloxane resin on both sides for scratch resistance and a wide field of vision.
- Impact tested Passed STANAG 4296 testing with a steel ball fired at 540 kph.
- Depth and temperature rated Certified to -61 m / -200 ft and suitable for water below 10°C.
- Six-strap harness Fast rotating buckle system, and the mask can be doffed with one hand using the doffing handle.
- 3D equalization system Patented internal nasal closure device with three-way directional adjustment.
- Diver controls Purge button to clear water, dive/pre-dive lever for free-flow control, and a surface air valve for breathing ambient air at the surface.
- Comfort sealing Silicone face seal with patented bellows double-S spring profile and a redesigned silicone oral-nasal pocket with dual one-way valves.
- Quick-Detach System The fully integrated second stage can be removed quickly for maintenance or swapping (Level 1 technician certification required).
- Communication and accessory ready Built for underwater communication systems; the Extender Kit mounts cameras, lights and comms accessories.
- Sizes and colors S/M and M/L sizing in Black, White and Blue, with a unique serial number on each component.
| Product type | Integrated dive mask (full face) |
| Regulator type | Vertical, body-balanced second stage |
| Depth rating | -61 m / -200 ft |
| Cold water rating | Suitable for temperatures below 10°C |
| Impact test | STANAG 4296 (steel ball at 540 kph) |
| Visor | Polycarbonate, both sides coated with siloxane resin |
| Face seal | Silicone with patented bellows double-S spring profile |
| Oral-nasal pocket | Silicone with dual one-way valves |
| Head harness | Six straps with fast rotating buckle system |
| Equalization | 3D system, patented internal nasal closure device, 3-way adjustment |
| Sizes | S/M and M/L |
| Size S/M fit | Nose-to-chin 10 to 11.5 cm |
| Size M/L fit | Nose-to-chin 11.5 cm and above |
| Colors | Black, White, Blue |
| Certifications | CE marked, Category III PPE per EU Regulation 2016/425, EN 250:2014A, EU Type Examination (Notified Body 0477), ISO 9001:2015 |
| Warranty | Lifetime on the mask; 2 years on all other components |
| Width | 37.00 cm |
| Height | 35.00 cm |
| Depth | 27.00 cm |
| Manufacturer base SKU | OR02520 |
| Variant SKUs | OR025200, OR025201, OR025202, OR025203, OR025204, OR025205 |
- NEPTUNE III Integrated Diving Mask with integrated second stage
- Neptune III Backpack
- Doffing Handle
- Surface Air Valve
- Standard Hose
- QRS (Quick Removal System)
- Extender Kit / Extender Frame accessories
- Multitool
- Warranty registration
- Stickers
⚠️ 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
How do I choose between the S/M and M/L Neptune III?
Measure from the bottom of your nose to the bottom of your chin. Choose S/M if that distance is 10 to 11.5 cm, and choose M/L if it is 11.5 cm or more. Both sizes use a six-strap harness with a fast rotating buckle system, so you adjust strap tension after choosing the right size.
How deep is the Neptune III certified, and can it be used in cold water?
The Neptune III is certified to -61 m / -200 ft and is rated for water temperatures below 10°C. It is CE marked Category III personal protective equipment under EU Regulation 2016/425 and complies with EN 250:2014A, with EU Type Examination through Notified Body 0477. The mask is STANAG 4296 impact tested with a steel ball at 540 kph.
Can I add underwater communications or a camera to the Neptune III?
Yes. The Neptune III is built ready for underwater communication systems, and the included Extender Kit provides mounting points for cameras, lights and communication accessories on the mask frame. Contact us if you want help confirming which comms unit or accessory bracket pairs with your mask color and size.
What warranty comes with the Ocean Reef Neptune III?
Ocean Reef provides a lifetime warranty on the mask itself and a 2-year warranty on all other components, per the manufacturer product page. A warranty registration card is included in the box. Each component of the mask also carries a unique serial number for traceability, which supports service and warranty handling.
Review summary
Reviewers consistently say the mask stays clear, with several noting it did not fog up during their dives. One diver found the mask easy to use. Buyers report it arrives complete with tools, a hose and a bag. Ratings are high but come from a small number of reviews so far. Good fit for divers wanting a full face mask with clear vision.
What reviewers like
