Kidde Mariner 5 BC Fire Extinguisher with Gauge The Kidder Mariner 5 fire extinguisher is suitable for use on Class B (liquids and gases) and Class C fires (energized electrical equipment). This unit is fitted with a pressure gauge that provides at-a-glance status and is manufactured from lightweight aluminum and a tough nylon valve assembly. It also features a bilingual nameplate and carton. Specs: Discharge time 8-12 seconds. Discharge range 4-6 feet. Operating pressure 100 psi. Unit weight (Average) 2.85 pounds, which includes the 2 pounds of fire extinguishing agent.