Aqua Lung SeaQuest Dimension i3 BC 308401 006877

Mfg Part #: 308401

Aqua Lung SeaQuest Dimension i3 BC


Customer Reviews for Aqua Lung SeaQuest Dimension i3 BC:

See the top 20 most helpful scuba gear reviews

Average Customer Review: based on 1 reviews.

Rating: State of the Art
Reviewer: Andy S.
Very light but well built. i3 system worked brilliantly and was the envy of many a diver.

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Questions and Answers for Aqua Lung SeaQuest Dimension i3 BC:

  • Gary:

    what is the weight of the Aqua Lung Dimension i3?

    Darrick  (Certified Scuba Instructor at

    Hello Gary, the weight of this BCD is 7.7lbs. If you have any other questions or would like to place an order please feel free to give us a call at 1.800.347.2822.

  • Eric:

    Is the Aqua Lung SeaQuest Dimension i3 Scuba BC compatible with air integrated secondary air sources? For example the atomic aquatics SS1 octo?

    Bill  (Certified Scuba Instructor at

    No, there is no corrugated hose on the i3 system. You would use a standard octo setup with this BCD.

  • Carlos:

    Would you recommend the Axiom or the Dimension? What are the major differences if any?

    Darrick  (Certified Scuba Instructor at

    Hello Carlos, the Axiom BC is a jacket style which will inflate on the sides. Where as the Dimension is a back inflate BCD. Which only the bladder in the back will inflate. So there will be no side inflation on this BCD.

  • Philip:

    Can you mount twin tanks 2x130 on this BCD ? if not wich one do you sel that will be suitable, I am looking for one with integrated weightsystem. many thanks

    Bill  (Certified Scuba Instructor at

    This BC is designed for a single tank. A technical diving harness and wing would work better for doubles.

  • Paul:

    Do you guys have an AquaLung Dimension i3 in a Medium size in Stock for shipping?

    Bill  (Certified Scuba Instructor at

    For current stock it will be best to contact one of our instructors at 800-347-2822.

  • Michael:

    I have dilemma. I like this bc a whole lot, but Im 61 and 155 lbs. The M is a bit too short and the ML is too large in the waist. Any suggestions? Or should I just look for a better fit option with another manufacturer?

    Bill  (Certified Scuba Instructor at

    BCs typically do not take into consideration for torso measurements, so trying different manufacturers on for fit is the best way to choose. Waist and weight are the most important measurements.

  • Sean:

    i am looking to switch to a back inflate to help with streamling. my jacket bc lets my legs . the only way i can stop it is to zip tie 2 lb hard weights to upper d rings on each side. will my regular low pressure hose fit this bcd? or is there an additional purchase to be water ready?

    Bob  (Certified Scuba Instructor at

    All new bcds will come with a new Low Pressure Inflator hose. Your old one will fit, providing it is not for an alternate air/inflator unit.

  • Doug:

    I am fairly new to diving. I received my open water certification last February. I am looking to further my experience but will probably dive 2 to 3 times a year on vacation. I am looking for a back inflate bcd. Can you recommend at decent bcd?

    Bill  (Certified Scuba Instructor at

    thsi BC is a very nice back inflate sytle, it does have the i3 control which allows you to inflat or dump air from the bc with a push of a button. Very nice.

  • Doug:

    How do I choose the correct size bcd? What are the advantages of the i3 over the standard buoyancy controls?

    Bill  (Certified Scuba Instructor at

    Weight and waist are the most important sizing. The i3 valve is located at pocket level on the right side, no need to lift the inflator hose over head to dump air.

  • Salome:

    I purchased my i3 Dimension BC from a certified Aqualung dealer. Originally the sale going on was, if I bought the BC, computer and alternate air source from Aqualung, the warranty would include parts for life. I just had my BC, rig, and alternate air source service. Parts for the regulator and alternate airsource were provided as promised, but I was charge for service parts on the i3 BC. Why is Aqualang not honoring their all parts included policy for the entire package? As it stands, Im disappointed and seriously concerned about buying anymore products from Aqualung. Please clarify. Greatly appreciate any information you can provide. Respectfully, Salome

    Darrick  (Certified Scuba Instructor at

    Hello Salome, after you bought your gear did you go to the manufacture website to register the products. Also when you took your gear in for service did you show the dive shop that these items were under warranty and it has parts for life. If you did all of this you should not have been charged for the part of your service. Did you have your gear service with us or another dive shop. If you had this serviced with us we can have that part refunded. If it was with a different dive shop then I would contact them and see why they charged you for that service. If all else fails you can contact AquaLung directly at: (760) 597-5000 to make sure all of your gear is under warranty.

  • Drake:

    Large starts at 38" waist?? yikes.. Also Im 62" 185# 33"-34"w.. doesnt that keep me entirely out of this bc due to my height?? Anything else available with i3 technology that will fit my frame?

    Bob  (Certified Scuba Instructor at

    Height isn't the most important measurement in any bcd. Your waist will always be first as the bcd needs to fit the torso snugly in order to minimize the amount of shifting of the unit during the dive. The harness is adjustable and will typically fit taller users than they are rated for comfortably.

  • Carl:

    What size/type are the fittings on the inflator valve? Are they the standard 3/8"?

    Darrick  (Certified Scuba Instructor at

    Hello Carl, yes this is a standard power inflator connection. Any standard power inflator hose will work with this BCD.

  • Kyle:

    Does this come with the GripLock Tank Band?

    Darrick  (Certified Scuba Instructor at

    Hello Kyle, yes this BCD does have the metal buckle locking system on the tank strap.

  • Tony:

    I am looking to replace my current BC and when searching online I found a recall notice for the surelock weight release system is this still current. The recall was for 110,000 units. Thank you Tony

    Darrick  (Certified Scuba Instructor at

    Hello Tony, all the BCD in-stock are not part of the recall. We have sent them all back and the manufacture has sent us replacements.

  • guy:

    I am debating between the model "MARES HYBRID PRO TEC" And this model "SeaQuest Aqua Lung Dimension i3 BC." Or maybe one of the ZEAGLE BCD. What is the difference between them? I wanted to ask if you have the same product without the I3 system? What most BCD is the most successful?

    Darrick  (Certified Scuba Instructor at

    Hello Guy, fi9rst off the Mares BCD is a jacket style where as the other two BCD's are a back inflate style BCD's. As for the which one I would choose is the Zeagle brand of BCD.

  • James:

    With the Dimension i3 system how does one manually inflate the BCD?

    Darrick  (Certified Scuba Instructor at

    Hello James, if you are looking at the BCD on the left shoulder there is a oral inflation tube that you can use to manually inflate the BCD.

  • Louis:

    I am 6 ft. 38 inch waist and 230 lbs.Would a large or extra large fit me?

    Darrick  (Certified Scuba Instructor at

    Hello Louis, when you size a BCD the most important measurements are your Height, and Waist. So the size large would be the better fit.

  • mike:

    just a simple question.. im looking at the colors on your website for the Aqua lung SeaQuest Dim. i3 BC. Now the colors that are offered on the website here are said to be black and Charcoal. but when i youtubed the BC, at Simply, is showed a great about of blue all around near the intergrated weights. which of these are you selling? Id much prefer the straight black and charcoal. thank your for your time..

    Bob  (Certified Scuba Instructor at

    The artwork we use, we get from AquaLung for the products. The bcd''s are indeed black/charcoal as described, currently.

  • Jeff:

    I am interested in getting the Dimension i3 but dont know whether to get the Medium or the MediumLarge. I am 5 8", 205-215, waist at belly button is 40-42 inches. OTS is 40 inches

    Bob  (Certified Scuba Instructor at

    We would actually recommend the Large size for you.

COLOR: Black / Charcoal

The Dimension i3 is a feature-rich, back inflation style BC that incorporates Aqua Lung’s patented i3 inflation/deflation system. Its amazing comfort and stability come from the integrated Wrapture™ Harness System. The Dimension i3 is made from durable, fade-resistant materials and comes in a black/charcoal color combination. Integrated weights are held securely in place with SureLock II mechanical weight system.

An Aqua Lung first! The Dimension i3 is a back inflation BC with an integrated i3 inflation / deflation system. Loaded with features, this innovative buoyancy compensator is built with high quality materials keeping both comfort and style in mind.


  • The integrated i3 control system provides a single touch control for both inflation and deflation
  • Flat e-valves are very streamlined and effective. One-way design keeps water out
  • The multiple dump feature means that when you depress the i3 lever, all of the flat e-valves open at once! No more reaching for the wrong valve
  • Custom backpack is thin to keep cylinder close to your center of gravity and efficiently distributes the cylinder weight
  • The Wrapture Harness System works in conjunction with the shoulder swivel buckles (patented) to prevent ride-up and supports the weight pockets
  • The patented SureLock™ II weight system provides a simple, single pull release. Loading is as simple as insert and 'click'
  • Pull down oral inflator is easy to deploy and stow
  • A strong retractor band is used to pull in the sides of the bladder while deflating
  • An adjustable chest strap can be raised and lowered on a rail system
  • HP and MP hose routings through the back keep your entire kit low profile thus minimizing drag

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