Broken Coolant reservoir/expansion tank

A few pictures of a broken coolant tank on my Audi 100. I have hot glued the spiggot back together as a desperate emergency measure!
  1. New 'aftermarket' expansion tank installed
  2. New 'aftermarket' expansion tank installed
  3. picture showing where reservoir hose joins main radiator top hose.
  4. The spiggot looks to have deteriorated badly. It would not have taken much to break it.
  5. The rest of the spiggot is lodged in the hose that connects to the expansion tank
  6. Another view of the broken spiggot
  7. Before the flood
  8. pool of coolant on ABS part
  9. broken spiggot
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