Guardian/Full-Face Masks


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.



Communication specifics will differ greatly depending on the comm unit you are interested in. Below are some general answers to frequently asked questions. For more detailed information see product specs or contact your OTS salesperson.

1. How much range do you get with OTS comms?

The range greatly depends on the unit in which you buy. For wireless units you can expect to get anywhere between 50 m and 1500 m range, depending on the unit. For hard-wire your range will be the length of your ComRope.

2. Are all OTS comms compatible with one another?

All wireless units will communicate with one another as long as the divers are within range and on the same channel. However, you cannot communicate between wireless and hard-wire. Hard-wire units can talk to hard-wire units and wireless with wireless.

3. Can my OTS comms work with another brand of communications?

Although we cannot guarantee the quality of the communications in doing this, yes, our communications can work with competitor products, as long as you are on the same channel and within range. For best and guaranteed results, OTS comms should be used with OTS comms.

4. How long do communications last when operating using batteries?

There is no set answer on this. This is entirely based on the amount of communicating you are doing. The more you communicate the more battery power you use.

5. Can I integrate my communications system directly into my camera?

Absolutely! For those interested in getting the best sounding audio into their camera, we have a setup for you by wiring the comms directly to your camera. For more information contact an OTS salesperson.

6. What is the difference between a Hot Mic and a Super Mic?

The Hot Mic is a noise canceling, dynamic microphone that is the best sounding underwater microphone on the market. It is limited to being flooded when taken to depth. In other words, you do not want to flood it and continue to take it any deeper than 10 or 12 ft . The Super Mic can be flooded and taken to any depth with no problem. The sound quality is lower with the Super Mic as you are sacrificing sound quality for waterproofing.

7. If I have an Interspiro or another company’s buddy phone or EM assembly can I use it in my Guardian?

If not, can it be adapted for use in my Guardian?

Each mask has its own Buddy Phone or EM assembly configuration. While it’s the same product, the way in which they are installed are different. Therefore, an Interspiro communication unit cannot be used on any other mask and vice versa. You must purchase the comm unit that goes with the mask you are using.

8. Can my wireless equipment talk to an MK2-DCI or ComBox?

No, as stated above (#2), wireless equipment must be used with wireless and hard-wire with hard-wire. It will not work.


9. How can I tell the difference between the original M-48 and the current production model?

Frames that do not have Threaded Inserts are older model masks and Jaw Frames that have Threaded Inserts are new/current.  (See Picture Below)

M48 Jaw Frames