STANDARD AIR · COMPACT
Spare Air · 3 cu ft
A compact independent backup for your SCUBA setup.
View options →Diving
Diving · The original Spare Air
Your backup air.
Independent by design.
A compact cylinder and regulator, separate from your main SCUBA system. Choose the Spare Air package that fits your dive setup.
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Made in USASubmersible Systems · Since 1979Direct manufacturer support
01 / Choose capacity
Start with the compact 3 cu ft package, or choose 6 cu ft for twice the air capacity.
02 / Choose air compatibility
Standard-air and Nitrox-ready packages are available. Match the model to the gas you use.
03 / Complete your setup
Choose the compatible refill adapter and pressure indicator on the product page.
Four straightforward choices.
Compare capacity and air compatibility first. Each product page shows the current price, package contents, and available options.
STANDARD AIR · MORE CAPACITY
Spare Air · 6 cu ft
Twice the air capacity of the 3 cu ft model, in a larger cylinder.
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NITROX-READY · COMPACT
Nitrox-ready · 3 cu ft
The compact package configured for enriched air up to 40% oxygen.
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NITROX-READY · MORE CAPACITY
Nitrox-ready · 6 cu ft
The larger-capacity package configured for enriched air up to 40% oxygen.
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Why we invented Spare Air
One more breath.
A whole new idea.
After surviving an out-of-air emergency on a night dive, our founder Larry Williamson set out to create a compact, independent source of backup air. Spare Air made its trade-show debut in 1979.
That original idea still drives us: a self-contained cylinder and regulator, separate from a diver’s main tank. We manufacture Spare Air in Huntington Beach, California, and support the equipment we build.
Read our story →In divers’ own words
Real dives. Real experiences.
Excerpts from customer stories shared with Submersible Systems.
“I have carried a SPARE AIR with me as standard equipment for two years, but this is the first time I have had to use it in an emergency situation.”
“I made a very easy decision, I gave the second diver my primary regulator and I took out my SPARE AIR.”
A few things to know.
Does Spare Air connect to my main tank?
Spare Air has its own cylinder and regulator. It is an independent backup air source, separate from your main SCUBA system.
Does twice the capacity mean twice the dive time?
Capacity is a cylinder specification. Breathing duration varies with depth, breathing rate, exertion, and fill pressure. Use Spare Air as emergency backup equipment and follow its operating instructions.
How do I refill it?
Use a compatible adapter and a suitable breathing-air source at the pressure specified for your model. See our refilling guide and select the correct connection before ordering.
Choose your backup.
Find the capacity and configuration that suit your equipment.
Spare Air is emergency backup equipment for trained SCUBA divers. Read the owner’s manual, practice its use, and follow applicable diving training.