So a vigreux column does not have inlet our outlet tubes for water. It's just a tube, with a bunch of fingers sticking out of the walls on the inside. It would typically be affixed vertically on the boiling flask in a distillation setup. It's used for fractional distillation.

A typical setup would look something like this, but without the outlet tube at the top you see here.

To draw a vigreux, I would go with a diagram that looks something like this.

This is what an actual vigreux looks like.

Edit

By the way, the most commonly used angles for bends are 105º and 75º, NOT 90º like you have on your site. you also seem to be missing the two most common types of bends – the 75º still head, and the 105º vacuum takeoff adapter.

However, this little app is really coming along so far. Just a few little things you need to add! :)