
Z-Flex 3" or 4" Diameter Vent+Backflow Preventer, 6" length
Useful in colder climates for preventing freezing air from flowing back into the heat exchanger and freezing it and damaging the heater Specifications: • Vent material: AL29-4C stainless steel• 6" in length• Single wall• Certification: Tested to meet or exceed Underwriters Laboratories (UL) spec UL1738 and ULS636• Approval: Cat II, III, IV venting• Limited Lifetime Warranty Compatibility and cross reference: This item is the same as Takagi, AO Smith, American Heating part number 9007996005. This item is NOT a universal appliance adapter, and cannot be used to connect directly onto the water heater flue opening. It is compatible with the following tankless water heaters, as shown in their manual: American Water Heaters GT-510-P/N Indoor Liquid Propane/Natural Gas American Water Heaters GT-310-P/N Indoor Liquid Propane/Natural Gas American Water Heaters GT110-P/N Indoor Liquid Propane/Natural Gas A. O. Smith ATI-510-N/P Indoor Propane/Natural GasA. O. Smith ATI-310-N/P Indoor Propane/Na