2.5 - 3 in. Adapter Eccotemp FVI12, i12 /Rheem/Paloma by Z-Vent Z-Flex
This stainless steel adapter is compatible with certain Paloma, Rheem, Noritz heaters, plus the Eccotemp FVI12 and i12 series. It converts the flue opening from 2.5" to standard 3" Z-Vent venting. Total item length is 6".
This gadget has a clamp on one end to clamp onto the heater flue opening and a seal on the other female end. It connects the tankless water heater to 3" Z-Vent stainless steel Vent pipe.
Partial compatibility list
Rheem/Ruud RTG42 PVN (pronto! 4.2, RTG42PVN) and RTG42 PVP (pronto! 4.2, RTG42PVP)
The Z-Vent system is designed for use with boilers, water heaters, and high efficiency gas and oil heaters that have cool flue gases vented under pressure. Z-Vent pipe contains and locking band connections and built-in, fail-safe gaskets.
• Simple gasket connection: no sealant needed
To ensure that freezing air does not come back through the vent pipe, you must use a straight pipe piece with backflow prevention.