All vessels, including PWC, are required to have a Type B USCG–approved fire extinguisher on board if one or more of the following conditions exist:
- Closed compartments under seats where portable fuel tanks may be stored
- Double-bottoms that are not sealed to the hull or that are not completely filled with flotation material
- Closed living spaces
- Closed storage compartments in which combustible or flammable material may be stored
- Permanently installed fuel tanks (tanks secured so they cannot be moved in case of fire or other emergency are considered permanently installed)
Approved types of fire extinguishers are identified by the following marking on the label—“Marine Type USCG Approved”—followed by the size and type symbols and the approval number.