Z-flex

Available in 3-, 4-, 5- and 6-inch diameters, the Z-Vent III gas-vent system is designed for condensing furnaces and boilers as well as high-efficiency furnaces, pool heaters, and unit and water heaters. Installation requires no clamps or sealants, the company says, because the snap-connection pipe ends contain a built-in silicone gasket seal. The pipe can be cut to fit on site.

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