Hydro test of a 3 cubic foot Spare Air?

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The shop where I used to work sold these. I was surprised that any were exempt from hydro, but we checked the CGA-type regs and confirmed. I think the older ones were probably sometimes sold with the incentive: "never needs hydro". So if someone had heard this and later bought a 3000 psi one, they might be understandably confused.
 
You will probably be fine as long as you don't want to go to the Flower Gardens. The op there requires current hydro and VIS.
 
there is someting about cylendar diameter that determines testing requirements.
 
there is someting about cylendar diameter that determines testing requirements.

I don't remember the number, but I think it is about 1.5 inches. That is why CO2 cartridges do not have a born on hydro but spare airs do.
 
My ignorance out ways my knowledge on such things. DOT is about commercial commerce and not adding air to a limited accepted beer can.
 
https://www.shearwater.com/products/peregrine/

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