Typically the workshop begins with a 2 hour academic discussion focusing on the history of the Hogarthian double tank configuration with hands on application configuring their own doubles, including first stage & hose routing, wing options and proper harness fit as well as methods to make trimming the doubles easier.

 We'll then spend time discussing the potential failures (9 Failures) and how to identify and manage the failures.  Though this is not a critical skills class, and no failures will be induced by the instructor, we feel it's important the diver have an understanding of how the doubles work, and the possible issues they may encounter when using doubles.

This one day mini provides an overview of how to balance/trim your doubles, how the valves and manifold function and how to configure your doubles safely and efficiently.

​This is not a critical skills class.  No failures will be introduced by the instructor in this workshop.

Who is this class designed for?

The Doubles Mini is designed for any diver wanting to learn how to dive doubles, want to gain an understanding into how those valves, first stages and manifold work, or those who are struggling to get comfortable in doubles.

Doubles are not exclusive to technical or overhead diving.  They offer many advantages to the recreational diver, such as increased volume, redundancy and provide the convenience of not having to bring and switch out multiple tanks between dives on multi-dive days.

This 1 day workshop focuses on providing the diver the knowledge, tools and skills to get comfortable and balanced in doubles, as well as a thorough understanding of how, and why, they are configured the way they are, the possible failures associated with doubles and the identification and management of those failures.

Why take this class? 

Regardless of experience level, this workshop will improve your comfort in double tanks.  Divers new to doubles will appreciate the shortened learning curve on getting balanced and experienced divers will appreciate gaining the knowledge of why they are configured the way they are, as well as how to easily reach their valves.

Aspiring technical divers will appreciate the head start on their future technical training.

This mini doesn't just teach how to trim out doubles.  It provides the diver with the knowledge of how they should be assembled, how they are configured, why they are configured that way, how to identify and manage problems/failures and how to reach their valves.

Class Information

The Doubles Mini is a one-day workshop, including academic discussions, dry-runs and 2 dives.


We follow up the discussion with dry runs of valve drills.  Dry runs allow the student to practice the skills on land under the watchful eye of the instructor(s). 

Students will then conduct 2 dives working on gaining comfort, balance and trim in doubles, and practicing valve drills.

This mini will be video'd for educational and review purposes only.  We believe it is invaluable for students to visually focus on their individual in-water skills.  Learning to self evaluate is an important aspect of the workshop.  

Our focus is the complete dedication to your diving skills, knowledge & in-water practice.

Want to get a jump on your Doubles Mini?  Check out our Doubles Regulator Configuration Page


Minimum 16 years of age

Must be a certified open water diver from a recognized training agency

Overview/Course limits

Maximum depth is 60’.  Average depth 20-30'

All dives are to maintain a working PO2 of no greater than 1.4

Standard gas is air or 32%

Double tank configuration

No stage decompression

No overhead environments

Instructor to student ratio maximum 6:1 in open water, adjusting downward for environmental conditions.


All FKD classes are non-smoking

The use of prescription drugs must be authorized prior to the onset of diver training by a physician

Required Equipment

See our Equipment Requirements Page

Rentals are available for most equipment. If you have any questions on equipment requirements or rentals, please contact us prior to registering.

The Doubles Mini is designed to provide the diver the basic knowledge and skills to enjoy diving in the Hogarthian double tank configuration safely.

Doubles provide an advantage over the single tank by providing complete redundancy and larger gas volumes.  However, doubles can also be a bit tricky to balance and trim, due to the additional cylinder and hardware.  

Additionally, since doubles have 2 valves, 2 first stages and an isolation bar/manifold, the diver must have a thorough understanding of how each valve and first stage and the isolator work individually, as well as how they function together in a system, in order to dive the system safely.