Furnace Concentric Exhaust Vent Cap
thingiverse
Prevent small animals, children, javelins and dire rats from crawling up your furnace exhaust pipe with this nifty cap. This fits a 80.6MM OD, 67.2MM ID concentric furnace pipe. This cap DOES NOT REQUIRE GLUE. It has nubs to hold on to the pipe gently but should still be easily removable.
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