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About Mares MV 12S USA Regulator

The all chrome plated marine brass first stage regulator is a balanced diaphragm design which is environmentally sealed. The diaphragm membrane transmits the pressure changes to the internal mechanism eliminating the need for the surrounding water to enter the intricate mechanism. The benefit of this type of first stage design is that none of the internal parts are exposed to contaminants such as salt, sand, chlorine or pool acids. These environmental contaminants cause corrosion and mineral deposits to form on the internal mechanism deteriorating regulator performance.

The 12S USA, uses tri-material valve technology. This patented technology created to optimize performance, safety and reliability. The valve is covered with hard polyurethane (PU) and the sealing surface is a layered with a soft PU for a perfect seal. Tri-material (brass, soft PU and heavy-duty" PU) reaches new levels of durability.

Another unique feature of the first-stage is the Dynamic Flow Control (DFC). The DFC system minimizes the intermediate pressure drop during inhalation, making it possible to use a simpler more reliable second stage. No type of manual adjustment of the second stage is necessary due to the consistency derived from a first stage that guarantees a stable flow of air, even under extreme conditions. The first stage comes equipped with two 7/16" High Pressure Ports and four 3/8" Low Pressure Ports.

MV second stage was created from the experience of the Mares Laboratories. The MV is a lightweight, minimum dimensioned, and its characteristically compact shape, makes the MV easy to dive with. The special symmetrical shape means the regulator is equally easy to use on the right or the left, for increased safety.

The MV 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 case is made from sturdy and durable techno-polymer material that has superior resistance to abrasion. The MV is a reliable and simple downstream demand valve design. Available with a standard 3/8" threaded 29.5" (75 cm) Hose, weighs 29.95oz (849g), comes with a comprehensive owner's manual and is covered by a limited lifetime warranty.

Warranty Information

This product has a limited warranty of 24 months.
(800) 323-0465

Mares MV 12S USA Regulator Features

  • Revolutionary Design
  • Hose: 3/8" Threaded 29.5" (75 cm)
  • Weight: 29.95oz (849g)
  • Comprehensive Owner's Manual
  • 2 Year Limited Warranty
  • First Stage: Mares 12S Regulator
  • Balanced Diaphragm
  • DFC System
  • Material: Chrome Plated Marine Brass
  • Environmentally Sealed Design
  • Design Provides Protection from Sand, Salt, Chlorine, Pool Acid and Contaminants
  • Tri-Material Valve Technology
  • 4 LP and 2 HP Ports
  • Second Stage: Mares MV
  • 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

Mares MV 12S USA Regulator Specifications

1'St Stage Type
Balance Diaphragm
Lp Ports
Four, 3/8" Unf Threaded
Hp Ports
Two 7/16" Unf Threaded
Nitrox Compatible
Yes, Up To 40%
2'Nd Stage Type
Downstream Demand Valve
1'St Stage: Chrome Plated Brass 2'Nd Stage Case: Techno-Polymer
Hose Thread
Hose Length
29.5" (75 Cm)
Total Weight
29.95Oz (849G)
Weight [with packaging]
3.25 lb

MV 12S USA Regulator Customer Reviews

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Mares MV 12S USA Regulator

(based on 1 review)

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(0 of 1 customers found this review helpful)



By Carmine

from NY, NY

About Me Casual/ Recreational

See all my reviews


  • Left Or Right Sided Use
  • Nitrox Compatible


  • Causes Jaw Fatigue
  • Difficult Breathing
  • Wet breathing

Best Uses

  • Can't Think Of One

Comments about Mares MV 12S USA Regulator:

I purchased this as a backup regulator for my pony bottle. I liked the fact that it could be used as either a left sided or right sided regulator. I have a unique setup and mount my pony on the left rather than the right. Well the setup works well for me, but you go to your pony when you either run out of air in your primary, or your primary regulator fails. Both stressful situations and not the time to have to breath off a bad reg, don't make my mistake, buy a really good reg for your redundant air source!

  • Was this a gift?:
  • No

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Questions about this item:

kasey h  Will this work with a 30cf pony bottle with a pro valve?
JOHN T  i have no clue but at 200 bucks its cheap and of good quality and i love the shape of the mouthpiece very compact for travel. i had an old one i replaced with same
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