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Mares MV Octopus

58 reviews
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List: $169.00

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About Mares MV Octopus

Featured Reviews

See all 58 reviews

Great Octopus at a Great Price

By Raymond V.

Mares took over the Dacor line and continue to make this Viper design type octopus. Functional for a great price. It is not a primary regulator, but a good low profile octopus that is low weight which is important with all the weight restrictions in travel now.


Great Little Octo!!

By BradA

This a an octo folks, not a 2nd stage primary reg. The guy from Texas stated gets labourous at 45 ft that he is spoiled and use to the 500 dollar regs. I hope your not using this as a primary 2nd stage. As a backup you can't beat the design. Cheers BA

Octopus MV was created from the experience of the Mares Laboratories, directly as a dedicated octopus. The MV Octopus is a lightweight, minimum dimensioned, and its characteristically compact shape, makes the MV easy to dive with. The special symmetrical shape means the octopus is equally easy to use on the right or the left, for increased safety. The MV Octopus Second Stage with its Vortex Assist Design (V.A.D.) System: all Mares second stages offer the unique patented VAD system. The air bypass tube conveys air to the mouthpiece creating a swirling vortex with a low-pressure area in the center this keeps the diaphragm down during inhalation, giving very sensitive and easy breathing at all depths.

The MV Octopus case is made from sturdy and durable techno-polymer material that has superior resistance to abrasion. The MV Octopus is a reliable, and simple downstream demand valve design. The MV comes with a standard 3/8" threaded yellow 39.4" (100 cm) hose and weighs 6.17 oz. (175 g).

This product can only be shipped to U.S. addresses.

Warranty Information

This product has a limited warranty of 24 months.


Mares MV Octopus Features

  • Mares MV Octopus:
  • Designed Specifically as Octopus Regulator
  • Symmetrical Shape: Left or Right Hand Usable
  • Light and Compact
  • Vortex Assist Design (V.A.D.) System
  • Case: Sturdy and Durable Techno-Polymer
  • Case has Superior Resistance to Abrasion
  • Reliable, and Simple Downstream Demand Valve Design
  • VAD:
    Air Bypass Tube Conveys Air to Mouthpiece Creating Swirling Vortex
    Low-Pressure Area Center Keeps Diaphragm Down During Inhalation
    Very Sensitive and Easy Breathing At-All-Depths
  • Lightweight Techno Polymer Housing
  • Hose Thread: 3/8"
  • Yellow Front Cover for Easy ID
  • Weight: 12.84 oz. (364 g), w/Hose

Mares MV Octopus Customer Reviews

Review Summary


(based on 58 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Great Octopus at a Great Price

Mares took over the Dacor line and continue to make this Viper design type octopus. Functional for a great price. It is not a primary regulator, but a good low profile octopus that is low weight which is important with all the weight restrictions in travel now.


Most Liked Negative Review


Only in extreme emergency

So if Tom Petty wrote a song about this it'd be called Free Flowin. My wife has the rebel as a primary and it has random free flow issues also. The only real benefit to this is low profile. I'd only use this if there was no other regulator available - even to rent.

Reviewed by 58 customers



By Bazsi I.

from Orange , CA, US

Great Octopus! Cheap and does it’s job!


Mares MV

By Sherwood T.

from Phoenix , AZ, US

I needed to replace my old octo with a newer more serviceable unit. After doing complete consideration of my needs and where and how I will be using it, I decided this was the one for me. i am a warm water reef diver.The unit came with a light weight hose attached and it is also light weight both are hi visible yellow and the price was right (on sale). I have completed a number of dives with and it worked well at depth with nitrox. Sherwood Thornton Phoenix Arizona .


Great Octo at a fantastic price point

By Andrew W.

Found this octo to be perfect for my pony bottle. Easy to use, nice weight and size, I ended up ordering a second one for by backup reg set as well.


Sleek Compact Octo

By John P.

from Concord, CA, US

Mares quality in a compact package, certainly not a primary 2nd stage but breaths well as a back up. With the bright yellow hose you can stick it in a pocket and still locate it quickly. Also can lay flat against your BC with elastic keepers. Great bargain from Leisure Pro.


Good octopus

By Paulo L.

from Rio de Janeiro, RJ, BR

I've acquired this Mares MV octopus some days ago and I am really enjoying it. Good price and this onto gets its job done!


Excellent Octo!


from Nederland, TX, US

This is an excellent low profile octopus. Breathes easy and comes with an excellent holder to help streamline your gear.




from SEOUL, Dongjack, KR

It is easy to use because you do not have to worry about the bottom or top left and right when you wear it in your mouth.


Amazing octopus love it more than the 300 dollar primary

By Melvin O.

from Pensacola , FL, US

Got this for my first dive trip works amazing way better than my s12 primary easy air flow and light


The Octopus MV is outstanding...

By Papa

well designed octo that is very reliable and can be counted on when needed.


Slimline, easy to use does what it says

By Scogar

This is a simple slim line octo. It is comfortable and easy to retrieve and the 180 degree positioning makes it a super simple loaner for air emergencies. It doesnt free flow and the purge is easy to use in my experience. I added the Blue reef yellow flex hose and it was a great addition as removed a tone of weight from the rig. The mouth piece plug it comes with is perfect! the plug secures the reg and has loop for attaching to my BCD the octo remains secure and easily deploy-able. It isnt the easiest breather but it is an Octo and performs well as one but the features make it an amazing choice.


nice, cheap, simple

By Caco G.

attached this to my old aqua lung atlantis first stage (that´s right! rocking the old school) as an alternate second stage. slim, light, visible, foolproof and cheap!. hasn´t free flowed yet (took it on a 4 day diving trip on new years) breathes effortlessly. little warning though: it is bigger than it looks in the photographs. attached the mouthpiece cover to a quick release buckle with a zip tie, lost the cover on the first back entry. (ergo, avoid using zip ties)


A good second reg

By Ian

I do technical giving using independent cylinders & regs. This is a great left hand reg with good performance down to 50m. Ideal for a twin set.


Great octo

By Foundationer

It replaced my old Dacor octo on my Zeagle regs. Tested it on 10 dives,love it.


Mares MV Octopus by Mares

By Divemaster

The Mares MV Octopus is the perfect compliment to the Dacor Viper regulator made several years ago. It is slim, light, and perfect for use as a safe second. It is also very esthetically pleasing; a nice change from the old round units currently available.


Compact Octo

By Scuba C.

Slim design is unobtrusive and helps maintain streamline in water. Easily identifiable. Had full-size mouth piece despite compact size. No issues wit free flowing


Questions & Answers

Questions about this item:

Shopper  Why Did You Choose This?
Frederic G  Seems like a good choice as I am creating my own Regulator kit, Low profile and easy to use as it can be use on either side of the mouth as an emergency I believe is efficient
Kevin M  Recommendation from salesman, (Very Trustworthy)
Sherwood T  the price was right it also had solid reviews for what it will be used for
sebastian m  simple and gets the job done.
WILLIAM G  for a reasonably priced octo
NEAL R G  Terrific octo. Great Leisure Pro price. Would recommend highly, especially for instructors.
zachary a  I wanted a streamlined octo and the MV fits the bill. I also like that fact that it does not matter how I hand it off as well.
BARNEY C  This purchase was to match up with a Mares regulator that I had purchased earlier.
Stefano D  Chosen for its compact design and visible styling as a backup on trips and for teaching purposes.
CRAIG C  Great reg for backup or your buddy because it just as comfy upside down unlike other backups where you and your buddy pretty much have to be hugging so you both can breathe.
VALERIANO B  Not good. The idea was good but it's poor in construction and after couple of months got broken. I've bought it two times because I loved it but get damaged soon if you dive everyday as I do.
GERALD O  Good reliable Octo.
GERALD O  Good reliable Octo.
STEVE S  Awesome lowpro octo. Good for diving in kelp forests and in other overhead environs.
Felix F  Works fine and is very compact. I like the fact that it can be used either way. I routinely switch to my octo to make sure it is up to snuff and I noticed that this model breathes wet, something I don't feel is a problem for its intended life saving purpose. I think it is an excellent value for the money.
WILSON O  Compact, uni-directional, price, quality.
Mitchell R  Is the hose a braided miflex?
Mario C  yes it is a flex hose.
Stefano D  Can this be fitted with LeisurePro's yellow flex hose, or is the Octo's swivel feature part of the original Mares hose?
Frank L  Yes, flex hose will fit on here. There is no swivel on this second stage.
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