Had a hell of a time finding a suitable vacuum elbow to replace the broken one:
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I went to no less than three auto parts stores, before I found someone who actually knew what the fuck I was talking about. Guy at the first store - an Auto Zone - thought I was talking about a vacuum cleaner, the O'Reilly's I stopped at next was clueless - I looked over their Dorman "Help!" assortments (at both stores) and didn't see anything. Then I went to an Advanced Auto and the guy knew exactly what I needed and led me straight to it!
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Forensic analysis: The soft rubber elbow that I installed a couple of years back couldn't take the underhood heat, softened, then broke. Thumbnail was able to cut through the thing with little effort (circled). OEM rubber fittings don't have this problem. New hard plastic elbow replaced it - hopefully with better long term results.
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Installed. I used heat shrink to ensure a leak free installation.
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Glamour shot - center vent functionality restored! Hopefully it'll stay that way. At least I got to practice my macro photography skills.