This stainless steel adapter can be used with the Eccotemp FVI12 series taking it from a 2.5" to a standard 3" vent system. Total length is 6".
Note, you will need to purchase a straight pipe piece with backflow preventer to ensure that freezing air does not come back through the vent pipe. This also adapts Z-Vent to Noritz tankless water heater flue outlets.
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