What type of fire extinguisher on-board of a PWC?

PWCs and boats up to 26 feet must carry at least one B-I fire extinguisher unless exempt (i.e., Class A or 1, open, outboard motor, not carrying passengers for hire, etc).

A B-1 extinguisher may be a 2-pound dry chem, 4-pound CO2 or 6 quart foam, if properly labelled as USCG certified.

Boats 26 to 40 feet must carry two B-I or one B-II. If there is a permanently installed fire extinguisher system only one B-I extinguisher is required. For vessels 40 to 65 feet, three B-I or one B-II and one B-I extinguishers are required. Vessels in this class with permanently installed fire extinguisher systems are required to carry two B-I or one B-II extinguishers.

Vessels without combustible fuel onboard, no gasoline engine or no areas where vapors can be trapped are not required to carry a fire extinguisher.