$9 Steel Water Tank 4 3D model by xtreme3d. Available on CGTrader with 1749 polys and 1798 vertices. Geometry: Polygon mesh. Check it out on CGHub.
BLEND (Blender, filesize: 209 KB), OBJ (OBJ, filesize: 30.5 KB), 3DS (3D Studio, filesize: 56.4 KB), DAE (Collada, filesize: 213 KB), STL (Stereolithography, filesize: 176 KB)