VP4-9.4 Noritz Stainless Steel 4" Diameter / 9.4" Adjustable Single Wall Venting Pipe The VP4-9.4ADJUST is a clean and durable stainless steel single wall venting pipe. This 4 " diameter adjustable component is part of the N-Vent system, meaning its components form a perfect seal without the need to tighten. A quick-snap feature allows for easy connections making installation of a professional grade system easier than you would think.High temperature rated stainless steelEasy to install Quick-snap connectionUnique gasket enables tight sealSuperior design enables professional installation4" Diameter x 6.8" - 9.1"