The agent storage tank consists of an approved DOT or CE-TPED high pressure steel tank filled with a valve and internal siphon tube, factory filled with FK-5-1-12 fire extinguishant, and super-pressurized with dry nitrogen to 360 psi (25 bar) at 70 °F (21 °C). Tanks sharing the same manifold shall be equal in size and fill density.
Tanks are available in 8 Sizes, ranging from 8 litre to 343 litre. A nameplate is adhered to the tank displaying the agent weight, tare weight, gross weight fill density, and charge date. On the larger size tanks, an optional liquid level indicator is available.