Redundant Air Tanks

Catalina Pony Bottle Tanks with Pro Valve

70 reviews

SKU: AQUTP13

~~$189.95~~ Save: $16 (8%)

^$173.95

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In Stock

DESCRIPTION

A reliable, nitrox-ready aluminum pony tank with high flow capacity valve and convertible K-valve.

Pros

Perfect size for various needs
Sufficient air capacity
Economical price
Reliable backup option
Versatile for different diving scenarios

Spare-Air 3000 Kit

10 reviews

SKU: SX6B

^$389.99

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In Stock

DESCRIPTION

A completely redundant alternate air source kit that allows self-rescue in emergency out-of-air situations.

H2Odyssey Quick Release EAS Bag for 6-cu. ft. Tank

6 reviews

SKU: H2EASB6

~~$11.95~~ Save: $4.00 (33%)

^$7.95

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In Stock

DESCRIPTION

A durable nylon bag that securely holds a 6 cu ft cylinder for easy accessibility.

Thunderbird 40 cu. Ft Aluminum Tank with Pro valve

2 reviews

SKU: MTLTA40YL

^$264.95

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In Stock

DESCRIPTION

A 40 cu. ft aluminum tank with Pro valve, nitrox ready up to 40%, corrosion-resistant and convertible.

Thunderbird 19 cu. ft Aluminum Tank with Pro Valve

1 reviews

SKU: MTLTA19BR

^$224.95

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In Stock

DESCRIPTION

A corrosion-resistant aluminum tank with convertible valve options and nitrox readiness up to 40%.

Thunderbird 30 cu. ft Aluminum Tank with Pro valve

1 reviews

SKU: MTLTA30YL

^$259.95

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In Stock

DESCRIPTION

A corrosion-resistant aluminum tank with Pro valve, convertible to K valve, Yoke or DIN.

Spare-Air Nitrox Kit

SKU: SX27NB

^$319.99

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In Stock

DESCRIPTION

A redundant alternate nitrox gas source that allows for self-rescue in emergency situations.

Thunderbird 13 cu. ft Aluminum Tank with Pro Valve

SKU: MTLTA13YL

~~$194.95~~ Save: $17.96 (9%)

^$176.99

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In Stock

DESCRIPTION

A corrosion-resistant aluminum tank with a convertible valve and easy-grip rubber hand-wheel. Nitrox ready.

Thunderbird 6 cu. ft Aluminum Tank with Pro Valve

SKU: MTLTA6BR

^$164.95

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In Stock

DESCRIPTION

A corrosion-resistant aluminum tank with a convertible valve and easy-grip rubber hand-wheel.

Catalina 80 Cubic Foot Aluminum Tank with Pro Valve

151 reviews

SKU: AQUTA8RD

~~$349.95~~ Save: $59 (17%)

^$290.95

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In Stock

DESCRIPTION

A 80 cubic foot aluminum tank with a pro valve that won't rust, has great buoyancy, and a high flow capacity valve.

Pros

Well-made and durable
Good customer service
Variety of color options
Great price and value
Fast delivery time

XS Scuba Faber High Pressure Steel Tank

50 reviews

SKU: FBRHP100G

^$519.95

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In Stock

DESCRIPTION

A versatile high-pressure steel tank with buoyancy advantages, Nitrox ready up to 40%.

Pros

High gas capacity
Good value for the price
Excellent tank and valve setup
Fast delivery and great condition
Improved buoyancy characteristics

XS Scuba Pony Bag

14 reviews

SKU: XSSPBB13

^$22

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In Stock

DESCRIPTION

A sturdy and secure pony bag that easily connects to your primary diving cylinder.

Tank to Tank Equalizer with Pressure Gauge

11 reviews

SKU: AQUTTED

^$169.95

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In Stock

DESCRIPTION

A chrome-plated brass Tank to Tank Equalizer with Pressure Gauge for maximizing air availability and easy equalizing of cylinders.

Blue Reef Cross-Over Equalizer

6 reviews

SKU: AQUTCED

~~$169.95~~ Save: $55.00 (32%)

^$114.95

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In Stock

DESCRIPTION

A blue tank accessory with chrome plated brass fittings that maximizes air availability and is equipped with bleeder valves.

Thunderbird 80 cu. ft Aluminum Tank ~ Limited Time FREE with Thermo International Valve, Tank Boot and Valve Cap

2 reviews

SKU: MTLTA80BL

~~$344.95~~ Save: $80 (23%)

^$264.95

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In Stock

DESCRIPTION

A corrosion-resistant aluminum tank with a convertible valve and easy-grip rubber hand-wheel.

H2Odyssey Extra Air Source Yoke Filler Adapter

2 reviews

SKU: H2EASYFA

^$46.95

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In Stock

DESCRIPTION

A durable chrome plated adapter that allows for easy filling off of a standard yoke valve.

Catalina 63 Cubic Foot Aluminum Tank with Pro Valve

2 reviews

SKU: AQUTA63YL

~~$329.95~~ Save: $54 (16%)

^$275.95

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In Stock

DESCRIPTION

A 63 cubic foot aluminum tank with a pro valve, rust-free and buoyant, with high flow capacity valve.

Dive Rite Rec XT Wing Dual Bladder

SKU: DIV5300D

^$670

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In Stock

DESCRIPTION

A Dive Rite Rec XT Wing with dual bladder for two 85 cubic feet tanks, made of durable technical fabric.

Highland by XS Scuba 90 Degree Gauge Adapter

SKU: XSSNDGA

^$45

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In Stock

DESCRIPTION

A corrosion-resistant chromed brass gauge adapter that allows for mounting a mini tech gauge to an HP hose.

Hollis DT Wings

SKU: HLSDTW45

^$649.95

+ wishlist

In Stock

DESCRIPTION

A durable and versatile Hollis DT Wings with multiple lift capacities and easy-to-reach OPV's.

Highland by XS Scuba Inline Gauge Adapter

SKU: XSSIGA

^$51

+ wishlist

In Stock

DESCRIPTION

A chrome-plated brass inline gauge adapter for mounting a mini tech gauge to an HP hose.

Zeagle Single Pressure Gauge, Imperial 11" Rubber Hose

SKU: ZGLPGMH11

^$169.95

+ wishlist

In Stock

DESCRIPTION

A durable and compact pressure gauge with a short 11" rubber hose for easy monitoring underwater.

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Redundant Air Tanks

Redundant air tanks have become an essential addition to the gear setup of divers who value preparedness and safety, especially as diving conditions shift in the winter months. As water temperatures drop and visibility can change unexpectedly, having a backup air source provides peace of mind and an extra layer of security. Redundant air tanks, whether in the form of compact emergency cylinders or larger pony bottles, serve as a dedicated reserve supply, completely independent from your primary tank. This distinction is crucial: unlike a buddy’s alternate air source, which still draws from the same main cylinder, a redundant tank is a self-contained system. For divers exploring deeper wrecks, venturing into colder offshore sites, or those who simply want to minimize anxiety and maximize self-reliance, this equipment is invaluable. Technical divers, solo adventurers, and instructors often rely on these systems, but they are equally suitable for experienced recreational divers who want to add a safety margin to their dives. In fact, gifting a redundant air tank to a passionate diver—especially during the winter season, when gear upgrades are top of mind—shows a thoughtful understanding of their commitment to safe diving practices.

Selecting the right redundant air tank involves several important considerations. The size and capacity of the tank should match the type of diving you do: smaller, ultra-compact units are designed for brief emergencies and can be easily stowed, while larger pony bottles provide several minutes of breathing gas, offering a more robust safety net for complex dives or colder conditions where stress on equipment is higher. For those planning extended or deeper dives, double-tank setups or sidemount systems provide even greater redundancy and gas management flexibility. Mounting options also play a role—some divers prefer tanks clipped to their BCD, while others opt for streamlined harness systems that keep the backup out of the way but instantly accessible. It’s important to remember that these tanks are not intended for routine use or to prolong bottom time; their primary purpose is to facilitate a calm, controlled ascent in the unlikely event of a primary air supply failure. Proper training is essential to ensure you can deploy and use the backup system effectively, as is regular maintenance—each additional piece of gear requires its own inspection and servicing schedule. For those new to redundant setups or looking to compare the full range of options, our Redundant Air Systems page offers a comprehensive overview of available configurations, helping you make an informed choice tailored to your diving goals.

Adding a redundant air tank to your dive kit is more than just a technical upgrade—it’s a mindset that prioritizes safety, responsibility, and the ability to handle the unexpected. Divers who have found themselves in challenging conditions, whether separated from a buddy in low visibility or managing an equipment issue in colder water, know the value of having an independent backup. The confidence that comes from knowing you have a reliable reserve allows you to focus on the underwater experience, whether you’re exploring a sunken ship, photographing marine life, or guiding students through their first open water adventure. As you plan your next dive, especially during the winter months when conditions can be less predictable, consider the added assurance a redundant air tank can provide. It’s a practical investment in your own safety and a thoughtful addition to the gear of any diver who takes their underwater adventures seriously.