Low Volume First Stage Regulators

Cressi XS2/AC2 Piston Regulator

57 reviews

SKU: CSBRXS2

~~$289.95~~ Save: $70 (24%)

^$219.95

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In Stock

DESCRIPTION

A dependable piston regulator with a marine-grade brass 1st stage and durable hi-tech polymer 2nd stage.

Pros

Lightweight and comfortable
Reliable and dependable
Affordable and good value for money
Easy and effortless breathing
Versatile and works in both cold and warm water

Mares Prestige 15X and Prestige Octopus Package

32 reviews

SKU: MRSPKPRGY

~~$619.90~~ Save: $270.90 (44%)

^$349

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In Stock

DESCRIPTION

A lightweight Mares regulator package with diaphragm first-stage, 4 LP ports, and 2 HP ports.

Atomic Aquatics T3 Titanium Swivel Sealed Regulator

15 reviews

SKU: ATMT3RY

^$2369.95

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In Stock

DESCRIPTION

A lightweight, titanium regulator with a swivel feature for easy breathing and unparalleled reliability.

Oceanic Alpha 8 SP5 Piston Regulator, Black

13 reviews

SKU: OCNA8SP5BK

^$334.95

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In Stock

DESCRIPTION

A durable black piston regulator with easy breathing, Nitrox compatibility, and exceeding safety standards.

Hollis DC7 500SE Regulator with Maxflex Hose

10 reviews

SKU: HLSDC75D

~~$749.95~~ Save: $350.00 (47%)

^$399.95

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In Stock

DESCRIPTION

A high-performance regulator with over-balanced diaphragm, servo-controlled 2nd stage, and environmentally sealed first stage.

Highland by XS Scuba Compact DIN First Stage

9 reviews

SKU: XSSCDF

^$109.95

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In Stock

DESCRIPTION

A compact and low profile DIN first stage with fail-safe flow, made of marine grade brass.

Cressi XS2/AC2 Regulator and XS Octopus Package

9 reviews

SKU: PCKXS2

~~$344.90~~ Save: $69.95 (20%)

^$274.95

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In Stock

DESCRIPTION

A lightweight, high-performance regulator and octopus package with a non-balanced flow-by piston design.

Atomic Aquatics B2 Regulator Yoke

8 reviews

SKU: ATMB2S

^$969.95

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In Stock

DESCRIPTION

A lightweight, all-titanium regulator with adjustable 2nd stage and patented comfort swivel for easy breathing.

Atomic Aquatics ST1 Swivel Sealed Regulator

7 reviews

SKU: ATMST1SS

^$1649.95

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In Stock

DESCRIPTION

A corrosion-resistant stainless steel regulator with smooth breathing and tangle-free movement.

Atomic Aquatics B2 Sealed Regulator Yoke

7 reviews

SKU: ATMB2SS

^$1019.95

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In Stock

DESCRIPTION

A lightweight, ergonomic regulator with a titanium second stage and patented comfort swivel.

Dive Rite XT Regulator

6 reviews

SKU: DIVRG5300Y

^$575

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In Stock

DESCRIPTION

A patented, environmentally sealed regulator with optimal hose routing and Teflon-coated parts.

Atomic Aquatics M1 Regulator Yoke Sealed

6 reviews

SKU: ATMM1BK

^$1019.95

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In Stock

DESCRIPTION

A high-performance regulator designed for extreme diving situations, with nitrox-ready capabilities and freeze protection.

Dive Rite XT1/XT2 Advanced Open Water Regulator Package

5 reviews

SKU: DIVPK53Y

^$975

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In Stock

DESCRIPTION

A streamlined, environmentally sealed regulator with adjustable 2nd stage and cold-water ready components.

Scubapro MK25 EVO/G260 Regulator

4 reviews

SKU: SCPM25EG26

^$1049

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In Stock

DESCRIPTION

A high-performance regulator set with adjustable 2nd stage, 5 LP ports, and enhanced freezing resistance.

Atomic Aquatics B2 Sealed Regulator, DIN

3 reviews

SKU: ATMB2SDBK

^$1019.95

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In Stock

DESCRIPTION

A DIN-type, environmentally sealed first stage regulator with swivel design and automatic flow control.

Scubapro MK25 EVO/A700 Carbon BT Yoke Dive Regulator System

3 reviews

SKU: SCPM25EA7CB

^$1799

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In Stock

DESCRIPTION

A durable and sleek black regulator with adjustable 2nd stage and enhanced cold-water diving capabilities.

Scubapro Mark 2 EVO Regulator DIN, First Stage Only

2 reviews

SKU: SCPM2ED

^$319

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In Stock

DESCRIPTION

A lightweight Scubapro Mark 2 EVO DIN regulator with increased airflow and easy maintenance.

Scubapro MK25T EVO/S620 X-Ti Yoke Dive Regulator System

2 reviews

SKU: SCPM25TES620

^$2499

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In Stock

DESCRIPTION

A durable and versatile titanium regulator set with instant airflow and improved performance for all dive conditions.

Scubapro Mark 25 EVO Regulator DIN, First Stage Only

2 reviews

SKU: SCPM25ED

^$519

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In Stock

DESCRIPTION

A high-performing Scubapro first stage regulator with DIN fitting and 5 LP ports.

Mares Dual 15X Regulator

2 reviews

SKU: MRSD15X

~~$399.95~~ Save: $150 (38%)

^$249.95

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In Stock

DESCRIPTION

A lightweight and environmentally sealed regulator with stable air flow and effortless breathing.

Sherwood Oasis Pro Regulator

2 reviews

SKU: SWDRO

~~$494.95~~ Save: $260.95 (53%)

^$234

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In Stock

DESCRIPTION

A Sherwood Oasis Pro Regulator with moisture retention vanes, easy-breathing design, and environmentally sealed first stage.

Scubapro MK25 EVO/S600 Regulator

2 reviews

SKU: SCPM25ES60

^$1099

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In Stock

DESCRIPTION

A high-performance Scubapro regulator with adjustable inhalation control and superior cold water performance.

Scubapro Mark 25 EVO Regulator, First Stage Only

2 reviews

SKU: SCPM25E

^$519

+ wishlist

In Stock

DESCRIPTION

A top-performing Scubapro first stage regulator with superb inhalation sensitivity and 5 LP ports.

Mares Prestige 15X Regulator

2 reviews

SKU: MRSPR15XGR

~~$449.95~~ Save: $105 (23%)

^$344.95

+ wishlist

In Stock

DESCRIPTION

A compact and reliable regulator with advanced coating technology for durability and easy breathing.

Pros

Good basic reg
Dependability
Clear view
Breathability
Price

Scubapro MK17 EVO 2/S620 Ti Dive Regulator System

2 reviews

SKU: SCPMK17RI

^$1099

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In Stock

DESCRIPTION

A lightweight, titanium regulator system with sealed diaphragm and adjustable breathing for extreme diving conditions.

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Low Volume First Stage Regulators

Low volume first stage regulators have become a popular choice among divers who prioritize a streamlined, lightweight setup without compromising on performance or safety. These regulators are engineered with a compact design, making them exceptionally travel-friendly and ideal for divers who frequently explore new dive sites or embark on liveaboard adventures. The reduced size and weight not only make packing and transport easier, but also minimize jaw fatigue and bulk when paired with similarly low-profile second stage units. Many technical divers and seasoned recreational enthusiasts appreciate the ease with which these regulators integrate into minimalist rigs, sidemount configurations, or as part of a redundant system. The low internal volume in the first stage means less gas is required to clear the system during checks or in the event of a purge, which can be especially valuable in cold water or high-silt environments where reliability and quick response are paramount. As autumn ushers in cooler water temperatures and shifting dive conditions, the advanced sealing mechanisms and corrosion-resistant materials commonly found in these regulators provide peace of mind for those who continue their underwater pursuits year-round.

When selecting a low volume first stage regulator, there are several key considerations to keep in mind. Divers who travel frequently will benefit from models that offer both DIN and yoke compatibility, ensuring adaptability to tanks at destinations worldwide. Those planning dives in cold or challenging environments should look for features such as environmental sealing and balanced diaphragm or piston designs, which maintain consistent airflow and reduce the risk of free-flow or freeze-up. The compact build of these regulators makes them an excellent gift for dive professionals, instructors, or anyone building a backup or pony bottle setup, as well as for newer divers looking to invest in equipment that will grow with their skills. The thoughtful engineering behind these regulators often extends to convenient hose routing and intuitive port placement, making it easier to tailor your configuration for comfort and accessibility—whether you’re donning thick gloves for a brisk October quarry dive or streamlining your gear for a tropical drift. For divers who prioritize maximum airflow for deep or high-exertion dives, it may also be worth exploring options among High Flow Regulators, which are designed to deliver increased breathing gas at depth or under heavy workload.

Ultimately, the choice of a low volume first stage regulator reflects a commitment to both performance and practicality. The durability and corrosion resistance offered by modern materials—such as marine-grade brass, chrome plating, or even titanium—ensure that your investment stands up to repeated exposure to saltwater, sand, and the rigors of travel. Many divers find that the reduced profile of these regulators not only enhances comfort but also minimizes drag and entanglement risk when navigating through kelp forests, wreck interiors, or tight swim-throughs. Whether you’re assembling a lightweight kit for spontaneous weekend getaways or upgrading your primary setup for demanding technical dives, low volume first stage regulators provide a versatile foundation that adapts to your evolving needs. As the diving season transitions and you plan your next underwater adventure, these compact regulators offer the reliability, convenience, and performance that make every dive safer and more enjoyable.