Pony Bottle
Definition
A pony bottle is a small, independent scuba cylinder used as a redundant air supply for emergencies.
More on Pony Bottle
Unlike a standard alternate air source, a pony bottle is a fully independent system with its own regulator. It provides backup air in case of primary system failure, making it ideal for solo divers or those in overhead or deep environments. Pony bottles come in various sizes, typically ranging from 6 to 30 cubic feet. They are mounted on the main tank or worn on a harness and require proper setup and training for emergency deployment.
Frequently Asked Questions
A pony is fully redundant. If your main tank or regulator fails, it provides a completely separate air source.
A typical 19 cf pony provides about 1–2 minutes of breathing time at 30 meters (100 feet), enough for a safe ascent.
It can be tank-mounted using clamps or carried on the side in a sling. Choose what’s comfortable and accessible.
Yes. Practice deploying it underwater, switching regulators, and ensuring it is turned on before diving.
Most shops can fill it if it’s properly rated and within hydro test date. Some may need adapters for small valves.