Check out WG 4011 - Pneumatic conveyor 3D model on CGTrader for $122. High-quality mesh by WorkGadgetAgro.
SLDPRT (SolidWorks, filesize: 37.9 MB), STL (Stereolithography, filesize: 6.78 MB), OTHER (Other, filesize: 13.7 MB), DXF (DXF, filesize: 64.1 KB), STP (STEP, filesize: 6.89 MB), PDF (PDF, filesize: 1.81 MB), IGE (IGES, filesize: 6.34 MB)