Unique gasket-tight seal;Quick snap connection;Superior design;Easy connect. Line up: 3-inch, 4-inch and 5-inch;Pleasecheckwithyour local laws forapplications. Plumbing items are in inches

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Noritz VP4-9.4ADJUST 4-Inch Diameter by 9.4-Inch Adjustable Straight Stainless Steel Single Wall VentingNoritz