Diaphragm First Stages

Explore the essential world of diaphragm first stages, a crucial component for any scuba diver seeking reliability and performance underwater. Diaphragm first stages are designed to deliver consistent air flow, making them an ideal choice for divers venturing into diverse aquatic environments. Whether you're diving in cold water or exploring warm tropical reefs, these first stages offer the versatility and durability needed to enhance your diving experience. With their robust construction and efficient design, diaphragm first stages ensure that you can focus on the wonders beneath the waves while maintaining peace of mind about your gear's performance. Dive into our selection and find the perfect match for your underwater adventures.

Cressi XS2/AC2 Piston Regulator

57 reviews

SKU: CSBRXS2

^$219.95

+ wishlist

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

Scubapro "300 bar" (4350 psi) DIN Conversion Kit

36 reviews

SKU: SCPDC3

~~$69.95~~ Save: $20 (29%)

^$49.95

+ wishlist

In Stock

DESCRIPTION

A Durable and easy-to-install DIN conversion kit for Scubapro regulators, perfect for traveling divers.

Pros

Fast and easy conversion
Excellent quality
Easy installation
Reliable
Works as advertised

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.

Scuba Regulator & Octo Grab Bag

15 reviews

SKU: SCBR1O

~~$514.90~~ Save: $134.95 (26%)

^$379.95

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In Stock

DESCRIPTION

A reliable and balanced scuba regulator and octo grab bag for underwater diving.

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.

Mares Prestige 15X and Prestige Octopus Package

10 reviews

SKU: MRSPKPRGY

~~$619.90~~ Save: $170.90 (28%)

^$449

+ wishlist

In Stock

DESCRIPTION

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

Mares Abyss 22 Navy II Regulator

10 reviews

SKU: MRSAN22

^$869.95

+ wishlist

In Stock

DESCRIPTION

A high-performance scuba diving regulator with an environmentally sealed, balanced diaphragm design for extreme conditions.

Hollis DC7 500SE Regulator with Maxflex Hose

10 reviews

SKU: HLSDC75Y

~~$749.95~~ Save: $400.00 (53%)

^$349.95

+ wishlist

In Stock

DESCRIPTION

A precision regulator set with environmentally sealed, durable materials and adaptable second stage positioning.

Cressi XS2/AC2 Regulator and XS Octopus Package

9 reviews

SKU: PCKXS2

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

^$299

+ wishlist

In Stock

DESCRIPTION

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

Scubapro MK25 EVO/S620Ti Dive Regulator System

9 reviews

SKU: SCPM25ES620

^$1185

+ wishlist

In Stock

DESCRIPTION

A high-performance regulator set with a balanced piston first stage and adjustable inhalation control.

Atomic Aquatics B2 Regulator Yoke

8 reviews

SKU: ATMB2S

^$969.95

+ wishlist

In Stock

DESCRIPTION

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

Cressi XS Compact Pro MC9 SC Regulator

7 reviews

SKU: CSBRCPS

^$389.95

+ wishlist

In Stock

DESCRIPTION

A lightweight, environmentally sealed regulator with enhanced performance and reduced effort for easy travel.

Atomic Aquatics ST1 Swivel Sealed Regulator

6 reviews

SKU: ATMST1SS

^$1519.95

+ wishlist

In Stock

DESCRIPTION

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

Dive Rite XT Regulator

6 reviews

SKU: DIVRG5300Y

^$475

+ wishlist

In Stock

DESCRIPTION

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

Dive Rite XT Advanced Open Water Regulator

5 reviews

SKU: DIVPK53Y

^$779

+ wishlist

In Stock

DESCRIPTION

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

Atomic Aquatics Z3 Regulator Yoke

4 reviews

SKU: ATMZ3RY

^$719.95

+ wishlist

In Stock

DESCRIPTION

A budget-friendly, high-performing regulator with self-lubricating seal, freeze protection, and swivel for easy underwater movement.

Scubapro MK25 EVO/G260 Regulator

4 reviews

SKU: SCPM25EG26

^$1063

+ wishlist

In Stock

DESCRIPTION

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

Scubapro MK25 EVO/A700 Carbon BT Yoke Dive Regulator System

3 reviews

SKU: SCPM25EA7CB

^$1749

+ wishlist

In Stock

DESCRIPTION

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

Sherwood Oasis Pro Regulator & Sherwood Octopus

3 reviews

SKU: SWDROOPK

~~$654.90~~ Save: $229.95 (35%)

^$424.95

+ wishlist

In Stock

DESCRIPTION

A reliable and environmentally sealed regulator set with balanced flow and high visibility soft purge cover.

Cressi XS2/AC2 Regulator, XS Octopus and Mini 2 Gauge

3 reviews

SKU: PCKXS22G

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

^$444.95

+ wishlist

In Stock

DESCRIPTION

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

Sherwood SR2 Regulator & Octopus

3 reviews

SKU: SWDSR2RO

~~$1024.90~~ Save: $189.95 (19%)

^$834.95

+ wishlist

In Stock

DESCRIPTION

A high-performance regulator system with advanced technology, true balanced first stage design, and NITROX compatibility.

TUSA RS-1001 Regulator

3 reviews

SKU: TBTRS1001BK

^$499

+ wishlist

In Stock

DESCRIPTION

A lightweight TUSA regulator with a balanced diaphragm design, adjustable sensitivity control, and high-flow ports.

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

2 reviews

SKU: SCPM25TES620

^$2785

+ wishlist

In Stock

DESCRIPTION

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

Mares Dual ADJ 62X 75th Anniversary Yoke Regulator

2 reviews

SKU: MRSDAAR

^$698.95

+ wishlist

In Stock

DESCRIPTION

A limited edition regulator set featuring a black intense ceramic coating and ultralight technopolymer construction.

Mares Pure SLS BCD, Mares Prestige 15X Regulator, Mares Prestige Octopus & Mares Mission 3 Gauge Console Bundle

2 reviews

SKU: PKGPROGR

~~$1287.99~~ Save: $488.99 (38%)

^$799

+ wishlist

In Stock

DESCRIPTION

A complete life support bundle featuring the Mares Pure SLS BCD, Prestige 15X Regulator, Prestige Octopus, and Mission 3 Gauge Console.

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Diaphragm First Stages

When exploring the world beneath the surface, the right equipment can make all the difference in both safety and enjoyment. Diaphragm first stages are a staple in the kits of divers who value consistent performance across a variety of environments. Whether you’re gearing up for a late-summer dive trip or prepping for cooler autumn waters, these regulators offer a level of reliability that’s especially appreciated by those who dive in challenging conditions. The sealed design of a diaphragm first stage helps prevent contaminants like silt, sand, or cold water from interfering with the internal mechanism, making them a popular choice for divers who frequent lakes, quarries, or colder coastal waters. This feature also means less maintenance and greater longevity, which is a real benefit for anyone who logs frequent dives or travels to diverse locations. For instructors, rescue divers, or those who guide groups, the peace of mind that comes from a consistent, dependable air supply is invaluable—especially when leading less experienced divers or venturing into unfamiliar environments.

Selecting a diaphragm first stage is about more than just technical specifications. Consider where and how you dive most often. If your adventures take you from the warm, clear reefs of the tropics to the brisk, kelp-lined coasts of the Pacific, the adaptability of a diaphragm regulator is hard to beat. Many divers recall the first time they plunged into colder water in late August, expecting their gear to freeze up or falter, only to find their diaphragm first stage delivering air smoothly and without hesitation. That kind of reliability builds confidence, letting you focus on exploring wrecks, searching for elusive marine life, or simply enjoying the tranquility of the underwater world. These regulators are also a thoughtful gift for anyone starting their journey in scuba, as well as seasoned divers looking to upgrade their setup. For students, the ease of breathing and the reduced risk of free-flow in cold water can make a huge difference in their learning experience. If you’re shopping for a dive buddy or family member, a diaphragm first stage is a practical choice that shows you care about their safety and comfort.

The versatility and ruggedness of diaphragm first stages make them a smart investment for divers at any level. They’re well-suited to travel, often lighter and more compact, fitting neatly into your gear bag alongside masks, fins, and wetsuits. As the seasons shift and dive conditions change, you’ll appreciate a regulator that performs just as well in warm, gentle currents as it does in chilly, silty waters. Maintenance is straightforward, and with proper care, a diaphragm first stage can last for many years—accompanying you on countless adventures, from spontaneous weekend dives to ambitious expeditions. If you’re interested in learning more about the mechanics and benefits of these regulators, or want to compare features before making a purchase, visit our comprehensive resource at Scuba Diaphragms. Here, you’ll find detailed information to help you make an informed decision, ensuring your next dive is as safe and enjoyable as possible.