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Today's Hours 8am - 11pm estThe Z-Vent 5" Universal Appliance Adapter is an essential component for connecting tankless water heaters, boilers, or commercial boilers to Z-Flex or Z-Vent AL29-4C stainless steel vent pipes. Compatible with most units, this adapter requires a single-to-double-wall adapter for double-wall installations. It features female connections on both ends and is constructed from Category III stainless steel, ensuring compliance with UL 1738 and AL29-4C safety standards.