(Use coupon vbofree to get this product for free, or buy me a beer for $1, Thanks )
This script creates pipes from edges in selected group(s)/component(s), also adding fittings to vertices. 
Usage: 
- "Build Pipes Branch":  All inside edges of selected group(s)/component(s) will be turned to pipe with options (collection, size, type of ending fitting and continue fitting...) can be selected in an input box.
- "Branches modifier": A tool help to edit fitting. The user can rotate, manually replace fittings, add/replace reduce bush, redraw branch(es)... Also can name and add color to any branch(es).
- "2D/3D": A quick switching of displaying the branches in 2D/3D view, base on turn on/off the layers "8_mep_piping2D" and "8_mep_piping3D".
- Double click (Edit Group/Component) to a branch will allow user to edit the source edges and vertices. The branch will be updated to it's "settings" when user finishes the Group/Component editing.
- Can make a BOM (Bill Of Materials) of pipes and fitting by using preset "PIPING" in VBO_Schedule Plugin.
 
PS: This version's shipped with only one collection of Metal Pipes. If you need more, go get the PRO VERSION