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Lewis,
Dry Chem Powder Extinguishers should have a label with working and test pressures listed.
If not, most dry Chem are typically between 1000 to 1350 kPa or 145 to 195 PSI.
Water Extinguishers are typically 700 kPa or ~100 PSI.
Foam Extinguishers are typically 1000 kPa or 145 PSI.
In Australia the Hydrostatic Test pressure is typically 2MPa or 290 PSI unless the manufacturer declares otherwise.
CO2 which run at a much higher pressure, typically tested to around 22MPa or ~3200 PSI.
So at ~30 PSI no problem.
Wash and dry to remove all powder residue, it is a corrosive salt.
Check for corrosion and dents or other damage.
A normal schrader valve is typically used.
Be careful if you use a taper thread fitting it may split the neck.
It is what I do, Neil.
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