Alternate Second Stages

Cressi XS Octopus

88 reviews

SKU: CSBOXS

~~$189.95~~ Save: $60 (32%)

^$129.95

+ wishlist

In Stock

DESCRIPTION

A reliable and high-performance Cressi XS Octopus with a lightweight design and dependable valve.

Pros

Great performance and breathability
Good value for the price
Easy to use and adjust
Budget-friendly
Reliable and durable

Scubapro Air 2, Combination Octopus/Inflator Regulator

49 reviews

SKU: SCPA2GYR

^$329

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In Stock

DESCRIPTION

A durable and versatile combination octopus/inflator regulator with easy-to-use features and a classic design.

Pros

Breathability
Reduces clutter and eliminates hoses
Convenient and practical
Combination of octopus and inflator
Streamlined design

Octopus Holder with Split Ring

38 reviews

SKU: AQUOHOR

~~$6.95~~ Save: $2 (29%)

^$4.95

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In Stock

DESCRIPTION

A corrosion-resistant octopus holder with a bright color for easy identification and debris prevention.

Pros

Keeps debris out
Bright color for easy identification
Prevents damage to reefs
Fits mouthpiece perfectly
Works great

Atomic Aquatics Safe Second Inflator (SS1), Stainless Steel

34 reviews

SKU: ATMSS1SRD

^$449.95

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In Stock

DESCRIPTION

A lightweight, streamlined stainless steel inflator with high flow 2nd stage and easy single hand operation.

Pros

Convenient
No leaks
Streamlined setup
Easy breathing at depth
Versatility

Mares Prestige 15X and Prestige Octopus Package

32 reviews

SKU: MRSPKPRGY

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

^$449

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In Stock

DESCRIPTION

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

Mares Prestige Octopus

29 reviews

SKU: MRSPRO

~~$169.95~~ Save: $45.00 (26%)

^$124.95

+ wishlist

In Stock

DESCRIPTION

A compact and reliable octopus with easy breathing and durable housing.

Pros

Good value for the price
Suitable for beginners
Durable and long-lasting
Easy breathing
Reliable performance

XS Scuba Second Stage Quick Disconnect

16 reviews

SKU: XSSSSQD

^$79.95

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In Stock

DESCRIPTION

A chrome brass quick disconnect for attaching multiple 2nd stages to a single hose.

Scuba Regulator & Octo Grab Bag

15 reviews

SKU: SCBR1O

~~$514.90~~ Save: $194.95 (38%)

^$319.95

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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

+ wishlist

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

+ wishlist

In Stock

DESCRIPTION

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

Tusa SS-0002 Duo Air II Alternate Combo Inflator

10 reviews

SKU: TBTSS02

^$299

+ wishlist

In Stock

DESCRIPTION

A combination octopus regulator/power inflator with an air balanced power inflator valve and classic downstream regulator valve.

Cressi XS Compact Octopus

9 reviews

SKU: CSBOC

^$159.95

+ wishlist

In Stock

DESCRIPTION

A reliable and comfortable Cressi octopus with a low profile design and non-corrosive materials.

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.

XS Scuba Alt Air Octopus

8 reviews

SKU: XSSAAOBK

^$97.95

+ wishlist

In Stock

DESCRIPTION

A classic downstream demand valve octopus with an intelligent in-line mouthpiece and Miflex hose.

Dive Rite XT2 Second Stage Only (No Hose)

7 reviews

SKU: DIVRG5200R

^$199

+ wishlist

In Stock

DESCRIPTION

A pneumatically balanced second stage with a carbon fiber cover and ABS plastic case.

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: DIVRG5300D

^$575

+ wishlist

In Stock

DESCRIPTION

A patented Dive Rite XT regulator with optimal hose routing, 5 LP ports, and Teflon-coated parts.

Aqualung Airsource Complete

6 reviews

SKU: UDRAS3QD

^$279

+ wishlist

In Stock

DESCRIPTION

A pneumatically balanced octopus and BCD inflator combo with soft-touch purge cover and rapid-exhaust valve.

Dive Rite XT Advanced Open Water Regulator

5 reviews

SKU: DIVPK53Y

^$975

+ wishlist

In Stock

DESCRIPTION

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

Scubapro S600 Regulator, Second Stage Only

5 reviews

SKU: SCPS600N

^$620

+ wishlist

In Stock

DESCRIPTION

A durable Scubapro S600 second stage regulator with adjustable inhalation effort and comfortable mouthpiece.

Cressi Octopus Compact Pro

4 reviews

SKU: CSBOCPN

^$179.95

+ wishlist

In Stock

DESCRIPTION

A low profile octopus with a comfortable silicone mouthpiece and smooth operation.

Scubapro MK25 EVO/G260 Regulator

4 reviews

SKU: SCPM25EG26

^$1049

+ wishlist

In Stock

DESCRIPTION

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

OMS Evoque 2nd Stage Only (No Hose)

4 reviews

SKU: OMSRESS

^$250

+ wishlist

In Stock

DESCRIPTION

A lightweight, adjustable 2nd stage regulator with a pneumatically balanced valve and ergonomic venturi lever.

Aqualung Leg3nd Octopus

4 reviews

SKU: UDRLO

^$319

+ wishlist

In Stock

DESCRIPTION

A pneumatically balanced octopus with easy work-of-breathing, venturi switch, and nitrox compatibility.

Sherwood Oasis Pro Regulator & Sherwood Octopus

3 reviews

SKU: SWDROOPK

~~$654.90~~ Save: $265.90 (41%)

^$389

+ wishlist

In Stock

DESCRIPTION

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

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Alternate Second Stages

Alternate second stages, often recognized by their bright yellow accents and distinctive longer hoses, are an essential part of any diver’s safety setup. These devices, commonly referred to as octopus regulators or simply “octos,” serve as a backup air source in the event of an emergency underwater. Whether you’re a recreational diver exploring warm tropical reefs in the winter or preparing for more technical dives in colder conditions, an alternate second stage ensures you and your dive buddy have a reliable way to share air if one of you experiences an out-of-air situation. The design is intentionally straightforward: a standard-sized mouthpiece, a highly visible purge button, and a hose typically longer than the primary regulator’s—often around one meter in length—so it can be easily accessed and shared between divers. Many divers choose to secure their octopus in a prominent location on the front of their gear, clipped within easy reach, so that it can be deployed at a moment’s notice. The bright color, usually yellow, isn’t just for aesthetics; it’s a deliberate safety feature that allows both you and your buddy to spot it instantly, even in low-visibility conditions or when adrenaline is running high.

Selecting the right alternate second stage involves considering several factors beyond just appearance. For new divers, durability and ease of breathing are priorities, as you want a regulator that feels comfortable and intuitive to use in stressful situations. Experienced divers, especially those venturing into deeper or colder waters, may look for features like environmental sealing or adjustable venturi settings, which can help prevent free-flow and optimize performance in challenging environments. Some alternate second stages are integrated with the BCD inflator, streamlining your gear and reducing hose clutter, while others are designed as dedicated units for maximum reliability. Technical divers, or those who regularly dive with overhead environments, often opt for even longer hoses—sometimes up to two or three meters—to allow greater separation during air-sharing ascents. If you’re shopping for a gift, alternate second stages make a thoughtful choice for dive buddies, family members, or anyone beginning their scuba journey; they’re a practical addition that speaks to care and preparedness. Many divers recall moments when their octopus regulator provided peace of mind, whether during training drills or real emergencies, reinforcing its role as a cornerstone of safe diving practices.

The versatility of alternate second stages extends across all levels of diving. From students practicing air-sharing drills in the pool to seasoned explorers navigating shipwrecks or caverns, having a dedicated backup air source is non-negotiable. The winter months, when water temperatures can drop and conditions may become more demanding, highlight the importance of a well-maintained and reliable alternate second stage. Cold water can increase the risk of regulator free-flow, so choosing a model with features suited to your environment can make all the difference. Regular servicing and familiarization with your gear are crucial, too; knowing exactly how your alternate second stage feels and operates, and ensuring it’s always within reach, can turn a potentially stressful situation into a controlled, safe ascent. For divers seeking more control over their breathing comfort, exploring options like Adjustable Second Stages can provide additional customization to match your diving style and preferences. Ultimately, the alternate second stage is more than just a piece of equipment—it’s a symbol of the buddy system and the shared responsibility that defines safe and enjoyable scuba diving.