Yep, this is the next in line of the unobtanium parts that I would love to see someone fabricate a replacement for. Mine was corroded through underneath the hoses to the point that I could crush it with my hands. I got lucky and found another xwebber who had a good used one sitting on the shelf that he was willing to part with.
Neither MWB, Vicks, or Obert had one when I was searching about 6 months ago.