ROUND-8 Toroidal Fuel Tank

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As of version 1.4 this fuel tank is only available via pre-made crafts. The fuel tank is replaced by the new R-12 'Doughnut' External Tank.
ROUND-8 Toroidal Fuel Tank
Part image
Liquid fuel tank by
Probodobodyne Inc
Radial size Small
Cost (total) 175.00 Funds
(dry) 147.46 Funds
Mass (total) 0.34 t
(dry) 0.04 t
Drag 0.15-0.2
Max. Temp. 2000 K
Impact Tolerance 6 m/s
Research Precision propulsion.png Precision Propulsion
Unlock cost 4 800 Funds
Since version 0.18
Part configuration fuelTankToroidal
Liquid fuel 27 Units of fuel
Oxidizer 33 Units of fuel

The ROUND-8 Toroidal Fuel Tank provides fuel to attached liquid fuel engines. Like the name said it's the only toroidal fuel tank currently available.


It is currently the second smallest liquid fuel tank in the game, after the Oscar-B Fuel Tank. It carries 150% of the fuel capacity of the Oscar-B Fuel Tank, despite having a smaller apparent size. This and its ability to stack very compactly make it is very useful for probes and small vehicles, but cannot have parts attached radially to it and it is wider than other parts of the tiny diameter. It is designed to fit in with the 0.65 meter form factor, or the 1.25m one, depending on the inner or outer radius.

Given the ROUND-8 is one of the few parts in Kerbal Space Program that is covered in orange multi-layer insulation and its round shape, it is often seen in the roles of wheels, life preservers, and warp coils in more artistic craft-although its functionality in such roles is doubtful.

Product description

An unconventionally shaped (but undoubtedly handy) fuel tank.

Probodobodyne Inc


  • Hidden from tech tree and part list
  • Cost decreased from 360 to 175, dry mass increased from 0.025 to 0.0375, total propellant increased from 22.2 to 60.
  • Initial release