HVACQuick.com Zflex Cat 3 Stainless Flue Pipe - 3 inch 2SVSI0304

3 to 4 inch pipe increaser. Connect 3 inch water heaters to 4 inch Zflex piping. Z-Vent is manufactured using AL29-4C advanced ferritic stainless steel with unmatched corrosion resistance for use with condensing furnaces and boilers. Z-Vent was developed in the early 1980s and has thousands of field installations to date. Z-Vent is now manufactured utilizing a fail-safe gasket connection. No sealant is required. Z-Vent is suitable for use with boilers, high efficiency furnaces, pool heaters, unit heaters and water heaters. 15 year limited warranty. Simple gasketed connection - no sealant needed. Features the highest pressure rating in the industry. The only metallic special gas vent you can cut to length on site. New fusion welded pipe seams for a smoother finish and better fit. 1 inch clearance to combustibles - can be installed where clearances are minimal.