Ocean Technology Guardian Full Face Mask 920001-001 029541


Mfg Part #: 920001

Ocean Technology Guardian Full Face Mask

with Buddy Phone D2 Add $570.00
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  • Guardian Full Face Mask
    • Free OTS Full Face Protective Mask Bag included
    • Double Seal to ensure the best seal possible
    • Includes Ambient Breathing Valve - allows the user to breathe ambient air at the surface 
    • Totally eliminates jaw fatigue 
    • Advanced air circulation prevents mask fogging
    • Breathe comfortably and naturally through both your nose and mouth
    • Mask flooding is almost eliminated
    • Nitrox Compatible to 40% (The Recreational Limits of Nitrox)
    • Integrated high performance 2nd stage
    • Regulator has side exhaust for less bubble interference
    • Easily adjusted Equalizing system - helps fit virtually all noses
    • Works with most 1st stage regulators-See below to order
    • Includes 2nd Stage Hose - comes off the right side (most preferred by divers)
    • Easily adjustable head straps and robust buckles
    • Weight: 6lbs
    • COLORS: All Black, Black with Blue accents, Black with Red accents, Black with Pink accents, Black with Green accents, Blue with Black accents, Yellow with Black accents or Clear with Blue accents
  • Upgrade to the Buddy Phone D2-See below for price 
    • Digital, micro-miniature, ultrasonic transceiver allowing communication between two
      or more scuba divers or surface stations
    • Using "Digital Signal Processing" techniques, the Buddy Phone produces uncompromising speech clarity
    • Voice menu to guide you adjust your Volume, change from channel A to channel B or in a continuous voice transmission mode


Customer Reviews for Ocean Technology Guardian Full Face Mask:

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Average Customer Review: based on 1 reviews.

Rating: Ocean Technology Guardian Full Face Mask Review - Scuba Gear Customer Reviews
Reviewer: LARRY C.  -  View all my reviews
The Guardian is absolutely the best full face mask (FFM) that I have ever used. I work in a FFM (using a Mantis, which is a nice mask), often of questionable water quality. Initially what attracted me to this FFM, is that the ambient breathing valve (ABV) is located high enough to be out of the water. Other FFMs place the ABV in a lower location on the mask, this ok for use on land... but at the end of the dive, when you are low on air, floating around in the middle of the night, kicking your way back to the boat on the ocean, you are going to suck water, unless it is flat calm and you like angling your head to the side to get the ABV out of the me on that one. The Guardian ABV is not only located in the correct place, the valve itself is a one way design. The double seal is very comfortable and does an effective job sealing against your face, just make sure that you are sealing against your skin and not on top of the hood (unless the hood is designed for that). An effective seal is very important in minimizing air consumption. The field of vision is excellant. The airflow in the mask is very effective in maintaining a truly fog free lense. This mask breathes very easily. I also like the fact that the second stage clips in and out of this mask in a solid manner and does not require any tools. The mask comes with a set of nose pieces to customize the fit and to enable easy equalization at depth. The only accessory that I am using at this time is an Omniswivel to streamline the hose configuration. I have also ordered a specially built second stage for use with a hookah, when I am working using hookah. OTS does offer a lot of different accessories, eg communication systems, eyeglass mounts, rail mounts for lights, camera, etc.,. A word about FFMs. Especially if you are new to diving, absolutely get some specialized training in using a FFM. The 5 strap mask strap is very secure, but you are not going to quickly slide it off your face to have a word with your buddy or gasp for air, especially if you are wearing 5-7mm cold water gloves. There are quircks to be aware of, and procedures to learn. How do you share air with your buddy? Are you diving with a bail out system or pony tank?, are you using a gas switching valve (GSV)? Can you R&R this thing underwater if you had to?, etc.. If you are willing to deal with the unique issues of the FFM, you will find that it is truly a great way to my opinion, it is the best way to dive.

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27 out of 36 people found this review helpful.

Questions and Answers for Ocean Technology Guardian Full Face Mask:

  • Ed:

    What would I need to take to A Jamaican resort to be able for them to attach this mask to their equipment/air tanks.

    Bob  (Certified Scuba Instructor at

    Typically most resorts will not do this for liability reasons. You'll usually either need to arrive with your own complete regulator set up or use theirs.

  • Ed:

    i am aware that you probably would not recommend someone with epilepsy to dive however i love diving and do not want to stop. in addition, my condition is under control by medication and i always dive with a buddy. but in the rare case that i would have a seizure under water, i would need a mask that enables me to breath through both my nose and mouth until my buddy gets me to the surface. would you recommend i use this mask or a different mask for that type of situation.

    Bob  (Certified Scuba Instructor at

    Based on your description this would work as you are seeking. and yes, our professional advice would be to strictly follow the advice of a physician with knowledge of diving and the effects of your medication under pressure. Remember, the ppm of substances absorbed into your system is going to increase with the pressures of increased atmospheres, just like the substances in the gasses you breath. Even normal medication that is okay on the surface can have adverse reactions at depth. A very good example is Oxygen. While O2 is perfectly safe to breathe at the surface, remember that it's toxic in as little as 20 feet of depth.

  • Mike:

    How does the performance of this mask with regard to clearance of CO2 build-up compare with the Interspiro AGA MkII - i.e. are do they use the same/similar system? Is it handled well at all? Or is this the big difference between the 2 masks?? Thanks, Mike.

    Arthur  (Certified Scuba Instructor at

    Hello, both are great masks and are designed to prevent the build up of Co2.

  • Bill:

    Is the OTS Guardian FFM Nitrox compatible to 40% oxygen content?

    Darrick  (Certified Scuba Instructor at

    Hello Bill, yes all of the OTS FFM come 40% Nitrox ready out of the box.

  • Gary:

    The Guardian FFM is on sale for 499.95 plus the option of Buddy Phone for 380.00. These two combined will it allow two divers to communicate or is there more parts to buy, Gary

    Darrick  (Certified Scuba Instructor at

    Hello Gary, you would need two set-ups like this if you want to talk back and forth. Nothing else is needed unless you would also need to talk to the surface. If you need to talk directly to the surface then yes you would need more.

  • sui:

    Hello Im from saudi arabia and i want to buy the product shown above but im not sure about the size of my face Nd how to determine my face size im confused If you guys can help me out to choose since its so hard if it didnt fits me right to return due to long distance shipping etc And if you can link to the most reliable face masks that peoples buying and the one that can withstand long depth more than 50 meters And mg last question is are they all allow you to reath from nose and mouth? Thank you so much gr8 website and helpfull Gratitude

    Darrick  (Certified Scuba Instructor at

    Hello Sui, this item is a one size fits all. Also this will work at your depth requirements. Also there is an adjustable nose piece that you can move up and down to fit different size faces. If you have any other questions please feel free to give us a call at 1.800.347.2822.

  • Justin:

    Does a person consume more air with the full mask

    Bob  (Certified Scuba Instructor at

    No. The full face mask doesn''t change the divers breathing rate.

    Arthur  (Certified Scuba Instructor at

    Hello, not at all. It is actually a more relaxed way to breath so you are conserving air.

  • Calvin:

    Is the guardian full face mask by ocean technology second stage hose compatible with scuba pros mk 25 first stage regulator ?

    Bob  (Certified Scuba Instructor at

    Yes. The fittings on 1st stages are generally universal, with just a very few exceptions.

  • David:

    If you do not buy the comms with this mask can you add them later.

    Bill  (Certified Scuba Instructor at


  • Tony:

    What is the model number on this OTS full mask? Thank you.

    Arthur  (Certified Scuba Instructor at


  • Chris:

    I saw on their website they have lights and camera mounts, but they dont ship outside of the US, can I buy them through

    Darrick  (Certified Scuba Instructor at

    Hello Chris, yes you can get these from us. Then we can ship them to you in any part of the world.

  • Jason:

    How does this mask compare with the Ocean Reef? I dove this past weekend with an Ocean Reef that was about 10 years old (I assume the design hasnt changed - looks identical to the new ones). I found that I had to put more effort into inhaling compared to a normal in the mouth 2nd stage. Even with the flow adjusted, at times it seems difficult to breath. I understand because of the distance between your mouth and the 2nd stage it can require more effort, but I was expecting it to be a little easier breathing.

    Bill  (Certified Scuba Instructor at

    The regulators have improved greatly in the last 10 years. Now they use a balanced 2nd stage which maintains ease of breathing. A ffm will seem different on the inhalation due to the extra volume but if the mask is put on and adjusted properly you should not even notice a difference after a few minutes of diving it. Either mask make an excellent choice. Setup and adjustment can make or break your experience.

  • Shane:

    can you confirm that this mask does not have serial numbers ( 9051284 through to 10070954)! They part of a recall

    Bob  (Certified Scuba Instructor at

    All masks we offer are brand new from the manufacturer and would be not included in any of their current recalls.

  • Nyla:

    Would this be an option for someone with a mustache and bears that doesnt want to shave it off?

    Darrick  (Certified Scuba Instructor at

    Hello Nyla, yes this mask will work for you if you do not want to shave. You will not have the issues with your mask seal on the full face mask that you do with your current mask.

  • Eugene:

    What is the size of the connection between the LP hose and second stage regulator? Id like to fit a swivel between the 2 components.

    Arthur  (Certified Scuba Instructor at

    Hello, it is a standard regulator connection.

  • Chris:

    Is it a good idea to fit a swivel on to the 2nd stage OTS guardian?

    Arthur  (Certified Scuba Instructor at

    It''s all personal preference. Swivel''s are great for normal 2nd stages to help with jaw fatigue. You don''t have a mouth piece with full face masks...

  • chris:

    Is it a good idea to fit a swivel on to the 2nd stage OTS guardian? if so what is cost & SKU? Do you recommend a spares kit for out of the main stream diving trips? if so what spares? is the new design of regulator (larger air delivery capacity) the only difference between Guardian & stealth? for rec diving guardian stealth not required?

    Bob  (Certified Scuba Instructor at

    That is correct. The higher flow, more high performance regulator was requested by commercial and professional divers working at greater depths and very extreme conditions. The Guardian is still the mask of choice from OTS''s line for all recreational diving. For a spares or save-a-dive kit, nothing out of the ordinary is typically needed.

OTS Guardian Full Face Mask

The Guardian line of Full-Face Masks (FFMs) is OTS' most recent innovation. Designed to meet the demanding needs of today's Commercial/Professional Diver, it leverages the best features found on other FFMs with unique features designed by OTS. The Guardian FFM comes in the following color combinations (skirt/hardware): black/black, black/blue, black/red, black/pink, blue/black, and yellow/black.

Features of the Guardian FFM include:
Removable 2nd stage for easy cleaning and storage (can't be used w/o mask)
Made of a one-piece, non-rigid silicone skirt combined with injection-molded, high-impact, glass-filled ABS plastic frame and regulator housing
A double face seal and slightly smaller oral nasal cavity to fit most faces
Equalization occurs through a nose block.
Air flow is directed up over the visor to eliminate fogging and through one-way valves in the oral nasal pocket to reduce CO2 retention.
2nd stage comes off the right shoulder and uses a standard LP hose
Includes a communications port for easy installation of a Buddy Phone® or ear/microphone assembly to connect an OTS Diver Communications Unit such as the Aquacom® SSB-2010
Includes OTS' Ambient Breathing Valve®, Mask Bag, and LP hose

1. How do you equalize in the Guardian Full-Face Mask?

Equalizing in the Guardian is simple. First you must adjust the equalizing assembly to fit you. We offer different size pads to build up the equalizing assembly to fit your nose. The equalizing block can also be moved higher or lower. You will then push up on the base of the regulator which will push the equalizing assembly up on your nose, blocking your nostrils, and allowing you to equalize.

2. What happens if my mask floods?

First off, due to the positive pressure inside the mask, it is very difficult to get water inside the mask. Even if you break the seal underwater, air will push water out instead of water coming in. Having said that, if you do manage to flood your mask, simply look up and press the purge button on your regulator. This will drain out the water. Resume normal position and take a hesitant breath to ensure all water is displaced. Repeat as necessary.

3. Can I use any 2nd Stage Regulator with my mask?

No. The only 2nd stage regulator that can be used with the Guardian is the OTS-designed regulator that is built into the mask.

4. I need glasses. Is there a kit for this?

Yes! Contact your OTS salesperson to find out how to install the eye wear accessory kit made for the Guardian. Your mask is already set up to use this!

5. What happens if my mask fogs? Do I still need defogger?

Due to the unique air system of Full-Face Masks you do not need any defogging agent. Your mask will not fog!

6. What happens if I forget to close my Ambient Breathing Valve® (ABV®)?

It’s always best to remember to close your ABV, however, if you forget to close it chances are you will be fine – no water will come in. That is, of course, as long as you remain at an upright position while underwater. If you leave your ABV open and invert upside down you can expect to flood your mask – and very quickly.

7. What’s the difference between Positive Pressure and Demand (Semi-Positive Pressure) regulators? Why would I choose one over the other?

The Guardian Full-Face mask is a demand regulator with a semi-positive nature. Having said that, positive pressure is a feature of some full-face masks primarily used by SCBAs to continually deliver air to you whether you are demanding it or not. These are used for fire fighting and hazmat emergency response. Positive pressure is designed to keep contaminants out of the mask if there were a break in the seal by blowing air out. A demand regulator gives you air as you “demand” an inhale when properly sealed.

7B.) Is a demand regulator positive pressure on a full-face mask while underwater?

Yes. A demand regulator does maintain a slight positive pressure while in an upright orientation. This is due to the position of the regulator being lower than that of the rest of the mask.

8. What if I run out of air while diving a full-face mask? How do I buddy breathe?

If you are diving a full-face mask, it is highly recommended you are familiar with emergency procedures and are comfortable doing them underwater. Get in a pool and practice if need be. Read your manual!

It is highly recommended that you have a spare air supply octopus, pony bottle, etc. and a small spare mask on you. If you run out of air, remove your full-face mask, utilize your spare air and don your small mask. You cannot buddy breathe using a full-face mask.

9. Does the Guardian come in different sizes?

Nope. One size fits most. Because of the Guardian’s unique double seal, the mask will fit almost everyone. If the first seal doesn’t fit properly, we’ll get you on the second seal.

10. Does the silicon material of the skirt degrade or lose shape? Is it as durable as rubber?

The silicone material is sturdy as can be and does not warp or degrade. You can fully expect for your Guardian Full-Face Mask to maintain its durability and shape regardless of how often you use it.

11. I want to use my Guardian with a Hookah system. What must I do for this?

We do not recommend using the Guardian with a Hookah system. The air pressure required for the Guardian is 135 psi, which is a much higher requirement than most Hookahs. Although it can be done, you may not be able to enjoy the Guardian at its full potential.

12. Why does the Guardian Visor have frosted sides? Can I get the visor without this?

Years of experience have taught us that without frosting the sides of the visor, many people experience vertigo, dizziness, or distorted views. Frosting the sides of the visor eliminates those problems and still allows for a great field of vision. Frosted visors are the only way they come.

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