$50 Simple manufacturing 250 airlocks-rotary valves 3D model by rasari35-0cf8ce. Available on CGTrader with 50 polys and 50 vertices. Geometry: Polygon mesh. Check it out on CGHub.
3MF (3D Manufacturing File, filesize: 3.17 MB), OTHER (Other, filesize: 1.66 MB), STP (STEP, filesize: 19.6 MB), IGE (IGES, filesize: 36.7 MB), X_T (Parasolid, filesize: 11.4 MB)