$9 Steel Water Tank 2 3D model by xtreme3d. Available on CGTrader with 994 polys and 1024 vertices. Geometry: Polygon mesh. Check it out on CGHub.
BLEND (Blender, filesize: 180 KB), OBJ (OBJ, filesize: 18.7 KB), 3DS (3D Studio, filesize: 32.2 KB), DAE (Collada, filesize: 120 KB), STL (Stereolithography, filesize: 99.9 KB)