I had a similar issue with a molded PVC baitwell pump manifold on a boat a few years back. I found a bolt that would fit in place of the soldering iron tip. I ground the head of the bolt into a suitable tapered shape for smearing molten plastic into the cracks. Fortunately it was a variable temperature iron, and I selected an appropriate temperature and went to work using pieces of another broken one I'd found in a junkyard. Sold the boat, but AFAIK it is still working.
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