Marine approved 75 ft³ (2.1 m³) of engine compartment volume. NFG models feature corrosion resistant non-refillable cylinders. Installation requirements 127mm wide x 478mm height. Automatic Discharge (Heat Actuated), Pressure Gauge, Pressure Switch (System Supervision and Discharge Indicator), Mounting Bracket (Vertical / Horizontal), Cylinder Status Indicator: 12VDC Light Bulb