hose barb connector 3d model

Create a precise parametric 3D CAD model of a STRAIGHT FUEL HOSE BARBED REDUCER. The part is a single straight cylindrical hose connector with two different internal diameters: 9.00 mm on one end and 8.50 mm on the other end. CRITICAL INTERNAL DIMENSIONS: - End A internal diameter: exactly 9.00 mm - End B internal diameter: exactly 8.50 mm - Both bores must be perfectly concentric with the same center axis. - The internal passage must be completely open from one end to the other. - Add a short smooth transition between the 9.00 mm and 8.50 mm internal bores. - Do not make the internal passage closed or capped. SHAPE: - Overall shape must be completely straight, with no bends or curves. - Cylindrical and rotationally symmetric around the center axis. - One end is slightly larger than the other because the internal diameter changes from 9.00 mm to 8.50 mm. - The outside should look like a hose barb fitting. EXTERNAL BARBS / RINGS: - Add multiple raised circular rings around the outsi