Z-Vent Z-Flex 2.5 - 3 in. Adapter, Rheem/Paloma/Eccotemp FVI12, i12
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)
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.