Coaxial Hollow Pipe Connector with Flanges

Create one coaxial hollow pipe connector with a 70 mm long, 40 mm outside-diameter central body between two 80 mm diameter flanges. Each flange is 6 mm thick, and the finished connector has a total axial length of 82 mm with a nominal 4 mm body wall. Maintain a continuous nominal 32 mm diameter cavity from one outward flange face to the other. At one-third of the body length, place a 15 mm wide annular rib on the cavity wall that projects 2 mm inward and reduces the local cavity diameter to 28 mm. At two-thirds of the body length, cut an 8 mm wide annular groove 1 mm outward into the cavity wall, increasing the local cavity diameter to 34 mm without breaking the exterior wall. Cut exactly four 6 mm diameter axial passages at the corners of a centered 30 mm by 20 mm rectangular pattern. Each passage runs through the complete 82 mm connector length along one shared axis, producing the same four openings on both flanges and intersecting the central body. Apply a 1 mm chamfer to the circular edges of the outward outlet-flange face only. The finished result must be one connected solid. All dimensions are in millimetres

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