ECM Espresso Knock Box Tubing

After three years of using my ECM knock box, the black silcone 20 mm X 10 mm X 155 mm tubing began to split.   I was unable to find a replacement tubing that would work.   Designed in Fusion 360.   I made the bar hole 11 mm to help the metal rod slide through.   I used TPU settings for temp in Prusa Slicer and 50% infill.  I had to use a raft to support it printing vertically.