There are different types and sizes of extinguishers, depending on the size of the boat.
There is a letter designation on the side of the extinguisher that tells you what size boat it goes on.
- Up to 26': One B-I size extinguisher. Fire extinguishers are not required on outboard-powered pleasure boats less than 26' in length, not carrying passengers for hire, without permanently-installed fuel tanks, that do not have spaces where explosive or flammable gasses or vapors can collect.
- From 26' to 40': Two B-I extinguishers (or one B-II extinguisher)
- From 40' to 65': three B-I extinguishers (or one B-I and one B-II)
These are the minimums to pass the Coast Guard inspection if you get boarded.