Compare Spare Air Models
Choose independent emergency backup air for your SCUBA setup. Spare Air combines a refillable cylinder and a demand regulator in one compact unit, independent of your main air supply.
3 cu ft · Model 300
Our compact standard model, with a 2.5-inch cylinder diameter and a full unit weight of 2.2 lb.
Shop 3 cu ftShop 3 cu ft Nitrox6 cu ft · Model 600
Twice the air capacity of the 3 cu ft model, with a 3.2-inch cylinder diameter and a full unit weight of 3.4 lb.
Shop 6 cu ftShop 6 cu ft NitroxCompare the specifications
| Feature | 3 cu ft / 300 | 6 cu ft / 600 |
|---|---|---|
| Air capacity | 3 cu ft / 85 liters | 6 cu ft / 170 liters |
| Length | 13 in / 33 cm | 13.3 in / 34 cm |
| Diameter | 2.5 in / 6.4 cm | 3.2 in / 8.2 cm |
| Full unit weight | 2.2 lb / 1 kg | 3.4 lb / 1.5 kg |
| Service pressure | 3,000 psi / 207 bar | 3,000 psi / 207 bar |
| Surface breaths* | 57 | 114 |
| Regulator | Balanced single-stage, breathe-on-demand | |
| Cylinder | Black anodized aluminum | |
| Nitrox-ready version | 300-N / 300PK-N | 600-N / 600PK-N |
| Made in | USA · Spare Air since 1979 | |
*Surface-breath figures are based on 1.5 liters per breath. They are not a guaranteed breathing time or ascent capability. Available duration depends on depth, breathing rate, exertion, and fill pressure. Full unit weights above are equipment weights, not shipping weights.
Standard air or Nitrox?
Choose the standard model for compressed breathing air, or the Nitrox-ready model for a compatible Nitrox diving setup. Our Nitrox-ready range is prepared for mixtures up to 40% EAN. Follow your model’s manual and the filling and training requirements for your breathing gas.
What comes in the package?
Standard packages include the Spare Air cylinder and regulator, a covered holster, a safety leash, a refill adapter, and an owner’s manual. Check the individual product page for the selected adapter, pressure indicator, and other available options.
Refilling, mounting, and support
Read our refilling guide for the correct equipment and procedure. See Operation for setup and use, or contact our team for help choosing your model.
Spare Air is emergency backup equipment for trained divers. Read and follow the operating manual and practice with your equipment before diving.