4 sided tube without rotation on plane:
-Create a plane
-Choose tube tool
-Check “every point” in tube tool snapping options
-Choose orthographic view / top to see plane in 90 degree
-Choose path from tube tool
-Draw points on plane
-Check green dot to create tube
-Reduce division x to 4 in mesh options, uncheck “constant density” before of course.
-If the tube is rotated 45 degrees carefully move the SECOND point of tube path. Again in orthographic top view of course.
-Tube rotation will snap between 0 and 45 degree.
-If it is 0 degree rotation, don’t move anymore 
