What is a "Pony Bottle"?
Lots of different names for the same physical thing, a tank of breathable gas with an isolated/separate regulator. But based on the name, it typically means something different. And is usually...a smaller thank than the primary, but filled with the same gas. It is also NOT used during Gas Planning. You also won't typically hear the term "Pony Bottle" used in Technical Diving scenarios. They would be using tanks/bottles called "stages" or "deco" or "bailout".How is a Pony Bottle typically carried?
Well...like everything in scuba...there is no "typical" way of doing something. There are several different methods:
Attached to Backmounted Tank
Pro:- It's out of the way
- It's out of the way
- Need to move it between tanks on a "two tank" dive day
- Can't hand it to a buddy
Side Mount / Side Slung
Pro:- Easy to don/doff
- Can see it if you need to during the dive
- Easy to get to during the dive
- Easy to "hand off" if your buddy needs it
- Requires Shoulder and Hip DRings
- Clutters up the side/front of the diver
How is a Pony Bottle typically setup?
With the exception of the attachment to the diver (back or side) the setup is generally the same.
You need:
UTD has a cool SPG Rigging Tip when side slinging.
- (1) Tank
- (1) 1st Stage Regulator
- (1) 2nd Stage Regulator (typically no octo/safe second)
- (1) Hose of an appropriate length
- (1) SPG (typically on a short hose of ~6 inches)
UTD has a cool SPG Rigging Tip when side slinging.
How big of a tank should I have?
I don't know....what's your dive plan? Why not use the Minimum Reserve Gas we already calculated for this dive as the maximum we would need? Using the example of a 100ft dive with an RMV of 0.75 and two divers on the same bottle surfacing at 10ft per minute, we can calculate how much gas we need using the most conservative CAT calculation...
...~40cft of gas. Which means if we sling a 40cft bottle that will be plenty, because we are not planning for full catastrophic air failure on all primary gas across both you and your buddy. This should be for one diver...and we will have enough for two. Note: Generally speaking, for a recreational diver, a 40cft pony bottle is the optimal choice in the Great Lakes region if you only want to own one Pony Bottle. Some divers will drop to 19cft because it is half the size and thus easier to manage, however they are cutting their margin of error in half. I personally want more conservatism in my risk calculation.
How much does a Pony Bottle cost?
| Item | Cost |
|---|---|
| 40cft Tank | $250 |
| 1st Stage Regulator | $300 |
| 2nd Stage Regulator | $300 |
| SPG \w 6" hose | $150 |
| Stage Bottle Rigging Kit | $70 |
| ~$1,000 | |