R.I. Gen. Laws § 31-23-46: Department of environmental management — Vehicles.

All vehicles in use by the department of environmental management shall be equipped with a fire extinguisher. The fire extinguisher shall contain a potassium bicarbonate base dry chemical fire extinguishing agent, have an underwriter’s laboratory rating of six (6) B:C, and a capacity of two and one-half pounds (21/2 lbs.).