Guardian Full Face Mask

Tech Course

OTS offers online courses to help you learn how to service our equipment properly. Courses include servicing instructions on: breaking down the Full Face Mask, breaking down the 2nd Stage Regulator, reinstalling components of the Full Face Mask, reinstalling the components of the 2nd Stage Regulator and proper adjustments of the 2nd Stage Regulator.  Guardian Technician certification is good for three years. Recertification requires retaking the class.

Required Items:

  • Guardian FFM (If the student has no access to a mask, please advise. A training mask can be provided at no additional cost.)
  • Your Guardian toolkit
    • No need to travel with the exploded view bench mat


Upon completion of class, the student will receive the OTS Service Certification, which is valid for three years.

Course Registration
Guardian Toolkit

Guardian Course Information

The OTS Guardian full-face mask technical/maintenance course will provide hands on training in the following areas of the Guardian FFM system:

  • Function of the regulator and mask.
  • Inspection of the external components.
  • Breakdown of the second stage regulator.
  • Breakdown of the mask body.
  • Parts identification.
  • Inspection and cleaning of the internal components.
  • Repair and replacement of parts.
  • Re-assembly of the second stage regulator.
  • Adjusting the second stage regulator.
  • Testing the regulator with the Magnehelic.
  • Troubleshooting the regulator.

What Do I need for the Class?

You will need an OTS Guardian Tool Kit to work on the mask and second-stage regulator. The kit contents are listed in the course descriptions on their respective pages. If you are re-certifying or have access to a kit, there’s no need to purchase one with each class unless you want to; we’re more than happy to sell all you’d like to purchase. Replacement tools are available individually.  

The Guardian online course consists of access to basically the power point program used during the in-person class augmented with a few quizzes. There are a few things you’ll need to effectively take the class in addition to the Guardian Technician Tool Kit, and be set to work on the masks and regulators. If you work for a dive shop or service center, you’ll most likely have access to test equipment. This is necessary to effectively adjust the second stage regulator and verify the performance.

The Guardian has a tool kit in a double-zippered bag with specialized tools for the mask and regulator, the Technician’s Manual, and a workbench mat with an exploded view.  You will need to bring it along with a Guardian mask and second-stage regulator to work on in class.  Bringing the workbench mat is optional.  If you’re using an older tool kit (pre-April 2024), you’ll need a 1/4 inch drive adapter for the Inner Clamp Ring Socket to the Screw Driver.  You may already have one in your toolbox, if not, they’re available at most hardware stores or on Amazon.  As an option to the adapter, you can bring a 6″ ratchet wrench with a 3 inch 1/4″ extension, but the adapter seems to work better and limits any over torquing you may get with the extra leverage of the wrench.  It’s also a good idea to bring a 6″ adjustable wrench.  Don’t forget an ink pen. UPDATE:  A 1/4 inch drive adapter is included with the tool kit now,  If you’re getting a new kit (post April 2024), no need to acquire one.
1/4 Inch Drive Adapter

Basic equipment is a magnehelic and an IP gauge.   There are several examples of these gauges, one recommended set is available from ScubaTools.com, however there are several other sources that have similar instruments that can be used. 

Dual Pro Stand

Additionally, a couple of tools that can make your job easier is ScubaTools inline adjustment tool (when ordering from ScubaTools, specify for the OTS Guardian) and an Omni-swivel Shut Off Valve (SOV-2). The inline adjustment tool will allow you to adjust the orifice without the need to remove the regulator from the low pressure hose and the SOV-2 will allow you to turn off the air pressure while making this adjustment.  The SOV-2 is available from OTS or from ScubaTools.  

Dual Drive Inline
Adjusting Tool
OTS Inline Adjusting Tool

ScubaTools also makes a snap ring installation tool as well.  This makes installation of the snap ring for the QD assembly on the mask a snap! (Sorry, couldn’t resist that)

OTS Snap Ring
Cone & Push Sleeve

For convenience and simplicity, ScubaTools has assembled these items in a kit:

OTS Guardian Kit

To take to online course, open and complete the registration form as explained below.  Once the business side is completed and you have received the course kit/material, you will receive an email with a link to login to the online course.  When you complete the course you will receive your certification and will be granted access the “Guardian FFM Tech Parts” under the Store pop-down.  Make sure you register as a user here on our website. 

New User Registration

Access to Technician Parts & Kits

1: Register & Pay

Click here to register for the course.
2: Complete Course

Take the online course at your own pace.

3: Access

Upon successful course completion you will see the “Guardian FFM Tech Parts” link for access to the shopping carts for various parts, kits, and components.

Additional Technician information and resources will also be listed with some of the shopping cart pages.

Note

You’ll need to re-certify every 3 years as your certifications expire. For the Guardian, it’s just a matter of taking the online course. 

When your certification expires, you’ll lose access to the shopping cart area of the website.

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