The Eccotemp FVI12 18" vent extension is for the FVI12 model. It is a stainless steel 2.5' x 18" Category II vent extension. Please remember customer assumes all liability when purchasing replacement parts.
With a properly sized Eccotemp tankless water heater, you will never run out of hot water and significantly reduce your energy consumption. Eccotemp tankless water heaters are the future of efficiency.