This morning I noticed that XirusCAD released their alpha version for Rhino 6 and they uploaded a video modeling a y-branch. It looked really good so I downloaded and installed the alpha version of the software and modeled my own version of the Y-Branch. I took a different approach to modeling than they did and believe the result is really good and more importantly easy to model. They have a bunch of videos on their channel regarding their tools and I highly recommend you check them out.