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Create cylinder with few sides.
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Convert the cylinder to editable poly.
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Choose polygon from selection group.
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Choose large round polygon and delete them (press Delete).
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Create flat box like the one on screenshot, and convert them to poly.
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Delete polygon near to cylinder.
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Select cylinder and go to Create menu, choose Compound objects from list and click Connect.
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Click Pick Operand and then click on box. Now, you have base for your tube.
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Convert them to editable poly.
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Select polys on opposite sides of flat part of the tube and extrude them a little.
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Extrude cylindrical part few times…
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and bevel the last one.
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Resize cylindrical part. You can use poly or edge selection, resize radius of individual “circles” to get proper shape of the tube.
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Choose edges that you can see on screenshot.
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And chamfer them just a little to prevent smoothing of those regions.
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Choose polygon selection and to Subdivision Surface menu. Check Use NURMS Subdivision, and set Iterations to 1 or 2. Do not enter higher values, your system will slow down, so 2 is far enough in this case.
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Now create cap from cone. Create cone like on screenshot and convert them to poly.
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Select circle polygons and extrude them a little.
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Select Edges and chamfer them.
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And extrude new polygons to the center of cap.
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Inset top polygon of the cap…
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…and extrude them.
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Inset and bevel opposite polygon.
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After that again inset this polygon and extrude them to top of the tube.
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Now you can add some details and texture this model.
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