Hello friends I will show how create a stock vector illustration 3d tube images.
I have used following techniques shown below in this 3ds max tutorial.
[1]-Choose the Chamfer Cylinder and create chamfer cylinder with the following size
Place the object like me 
[2]-Create box with the following size and palce like me 
[3]-Now boolean it 
[4]-Your object should like this 
[5]-Select the edges and apply the extrude edges with the good following amount as shown below 
[6]-Create another chamfer cylinder with the following size and place like me 
[7]-Apply the FFD 3×3x3 modifier and select the control point
Drag like me 
[8]-Create box with the following size and place like me 
[9]-Select the polygons and apply the extrude polygons with the amount of 1.4
[10]-Your object should like this 
[11]-Make the materials like this 
[12]-Set the skylight like this with the following parameters 
[13]-This is final images 
