Non Balanced Flow By Piston Regulators

Cressi AC2/XS2 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

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.

Aqualung Calypso Regulator

12 reviews

SKU: UDRCLR

^$389

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In Stock

DESCRIPTION

A lightweight and reliable Aqualung Calypso Regulator with adjustable 2nd stage and Nitrox compatibility.

Cressi AC2/XS2 Regulator & XS2 Octo Package

9 reviews

SKU: PCKXS2

~~$344.90~~ Save: $45.90 (13%)

^$299

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In Stock

DESCRIPTION

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

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.

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.

Atomic Aquatics M1 Regulator DIN Sealed

5 reviews

SKU: ATMM1BKD

^$1019.95

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In Stock

DESCRIPTION

A highly durable and corrosion-resistant Atomic M1 Regulator with DIN system, suitable for cold water and extreme diving.

Sherwood Oasis Pro Regulator

4 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.

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.

Cressi AC2/XS2 Reg, XS2 Octo and Mini 2 Gauge

3 reviews

SKU: PCKXS22G

~~$544.85~~ Save: $99.90 (18%)

^$444.95

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In Stock

DESCRIPTION

A reliable and comfortable regulator system with primary, octopus, and analog pressure/depth gauge console.

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 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.

Cressi AC2 Compact Yoke Regulator

2 reviews

SKU: CSBAC

^$329.95

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In Stock

DESCRIPTION

A reliable and high-performing Cressi regulator with adjustable 2nd stage and comfortable silicone mouthpiece.

Dive Rite O2 DECO Regulator

1 reviews

SKU: DIVRG5400

^$349

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In Stock

DESCRIPTION

A compact and lightweight DECO regulator with oxygen-compatible materials and advanced performance.

Scubapro MK25 EVO DIN 300/S620Ti Dive Regulator System

1 reviews

SKU: SCPM25ES620D

^$1249

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In Stock

DESCRIPTION

A high-performance, all-weather regulator system with excellent freezing resistance and instant air delivery.

Mares Dual 15X Regulator with Dual Octopus, Quad Ci Wrist Dive Computer and LED Tank Module 2.0 Transmitter

1 reviews

SKU: MRSD15XK4

~~$1587~~ Save: $307.05 (19%)

^$1279.95

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In Stock

DESCRIPTION

A lightweight, high-performance diving set featuring techno-polymer construction, advanced air flow systems, and a color display.

Cressi Start Equipment Dive Package, BCD XS2/AC2 Regulator, XS Octo, Mini 2 Gauge Console

SKU: PCKCSBSTPCK

~~$664.95~~ Save: $25 (4%)

^$639.95

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In Stock

DESCRIPTION

A complete scuba diving life support system with BCD, regulator, octopus, and gauge.

Cressi AC2/XS2 Regulator, XS2 Octo and Mini SPG Package

SKU: PCKXS2G

~~$469.85~~ Save: $114.90 (24%)

^$354.95

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In Stock

DESCRIPTION

A complete regulator system with primary, octopus, and analog pressure gauge for reliable diving.

Cressi Compact AC2 Regulator and Compact Octopus

SKU: CSBACROK

^$469.90

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In Stock

DESCRIPTION

A reliable Cressi regulator and octopus set with adjustable 2nd stage and enhanced performance venturi effect.

Scubapro MK2 EVO/R105 Regulator

SKU: SCPM2ER105

^$449

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In Stock

DESCRIPTION

A reliable and durable regulator set with a swivel 2nd stage, ideal for rental or backup use.

Cressi Solid Scuba Package + Mares Puck Pro Ultra Lite Computer

SKU: PCKCSBSLPP

~~$1182.75~~ Save: $407.80 (34%)

^$774.95

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In Stock

DESCRIPTION

A durable scuba package featuring a Cordura BCD, chromed brass regulator, and intuitive wrist computer.

Mares Rover 2S Regulator, DIN

SKU: MRSR2S2D

^$319.95

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In Stock

DESCRIPTION

A compact and ergonomic regulator with reduced breathing effort and a durable chrome-plated brass construction.

Mares Rover 2S Regulator, Yoke

SKU: MRSR2S2I

^$319.95

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In Stock

DESCRIPTION

A durable and lightweight regulator with dynamic flow control for easy breathing during intensive use.

Sherwood 70th Anniversary SR3 Regulator

SKU: SWD70ASR

^$799.95

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In Stock

DESCRIPTION

A platinum-finished, environmentally sealed piston regulator set delivering smooth, reliable airflow and exceptional durability underwater.

TUSA RS-1207 Regulator

SKU: TBTRS1207

~~$399~~ Save: $79.80 (20%)

^$319.20

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In Stock

DESCRIPTION

A durable, lightweight regulator with fail-safe flow-by-piston design and adjustable 2nd stage for easy breathing.

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Non Balanced Flow By Piston Regulators

When considering the right scuba diving equipment, understanding the distinctions between regulator types is crucial for both safety and enjoyment underwater. Non balanced flow by piston regulators, often referred to simply as unbalanced piston regulators, are renowned for their straightforward design and dependable performance in recreational diving scenarios. These regulators function with a flow-by piston mechanism, which means the internal piston allows air to flow directly from the tank to the diver’s second stage. Because the system is unbalanced, the breathing effort required can increase slightly as tank pressure drops or as you descend deeper, making these regulators best suited for shallower dives and environments where extreme depths are not the primary concern. This characteristic is not a drawback for most recreational divers, as typical dive profiles rarely approach the limits where the performance change becomes noticeable.

The simplicity of a non balanced flow by piston regulator is one of its biggest advantages. With fewer moving parts and seals compared to balanced or diaphragm regulators, these units are less prone to mechanical issues, making them exceptionally reliable for divers who value low-maintenance gear. This durability is why they are a staple in rental fleets and training centers around the world. Dive instructors, beginners, and those who travel frequently appreciate the peace of mind that comes from knowing their regulator is less likely to experience complications, even after repeated use and transport. The larger air passages found in piston regulators also facilitate a smooth airflow, and their design can accommodate higher oxygen mixes, which is beneficial for divers exploring nitrox or other enriched air blends. While the performance may dip slightly as the tank empties, the trade-off is a rugged, affordable, and easy-to-service regulator that stands up well to regular use in a variety of water conditions.

For those looking to purchase a regulator as a gift—perhaps for a friend or family member who is just starting their underwater journey—a non balanced flow by piston regulator is a thoughtful choice. The straightforward operation means less time spent on maintenance and more time enjoying the water, whether it’s a spontaneous winter getaway to a warm destination or a local dive during the crisp, clear days of January. These regulators are especially popular among dive schools for outfitting new students, as their reliability and ease of use help reduce the learning curve. If you or your recipient plan to advance to deeper or more technical dives in the future, you may eventually consider upgrading to a balanced system for more consistent breathing effort at depth. To explore those options, visit our guide on Pneumatic Balanced Regulators for a deeper dive into advanced regulator technology. In the meantime, non balanced flow by piston regulators remain a trusted companion for countless recreational divers, offering a blend of simplicity, affordability, and robust performance that makes every dive memorable.