VK4-V1 Noritz Stainless Steel Single-Wall, Vertical Termination Vent Kit  The VK4-V1 4" vertical vent kit is a stainless steel N-Vent kit that takes care of all the details of your exhaust pipe and termination pieces so you don't have to. With the appropriate adjustable vent, elbows, fire stop, and visible roof components, this vertical vent kit is easy to install and always appears as though a professional had installed it. As part of the N-Vent series, this product is UL approved category III venting, known for easy installation and forming tight seals.  Single Wall Venting: This stainless steel single wall vent kit refers to the pipe not being insulated, and at times hot to the touch, but with the product being installed out of reach, and on the roof, it is still the perfect choice for your water protection and tankless water heater venting needs. Noritz N-Vent is approved for tankless and boiler stainless steel exhaust installations, enabling you to know you've made the right choice in both form and function.High temperature rated stainless steelVertical applications onlyAdjustable ventingEasy installation with a professional finishIncludes 8 essential components