Z-Vent Gas Venting Products by Z-Flex

Z-flex brand stainless steel venting pipe, fittings and parts - approved for for installation with Category III (standard efficiency/non-condensing, power-vented) and Category IV (high efficiency/condensing, power-vented) gas fired appliances.
Recommended for Takagi and other brand tankless & storage-type water heaters, as well as wall-hung and floor-standing boilers.
Made in the USA from AL29-4C steel and meets UL 1738 standard.