Railcraft Tank - Feed The Beast Wiki
The Railcraft Tank is an expandable multi-block structure that holds a large amount of liquid. Valid dimensions are 3x3, 5x5, 7x7 or 9x9, from 4 up to 8 blocks tall. Railcraft Tank blocks may be crafted from Iron or Steel. Iron tanks are made of Iron Tank Walls, Iron Tank Gauges and Iron Tank Valves, and can hold 16,000 millibuckets of liquid for each block in the structure.