This basic water column is based on the columns used by the Harz Narrow Guage Railway in Germany,

Print in 3 parts: the base, which includes the water valve as a separate model, and the left and right hand sides of the top.

As printed it is about the right height for an LGB Stainz or a Bachmann 0-4-0 Porter.

The valve will need to be glued together, as will the top.