Noritz VT4-SH 4-Inch Hood Termination for Single Wall Stainless Steel Venting Noritz Tankless Water Heater Hood Termination, Single Wall, 4 In., Stainless Steel Quick snap connection The product is manufactured in United States Unique gasket-tight seal Quick snap connection Superior design Easy connect Line up: 3-Inch, 4-Inch and 5-Inch