The stainless steel angled roof flashing (ARF5) for 5 single wall venting for the Noritz DV and SV models is an aesthetic and durable roof piece. Utilize the ARF5 to weatherproof the vent pipe s penetration through the roof and protect your home from wet weather conditions. As part of the N-Vent series this product is UL approved category III venting and is an integral part of the quick-snap connection system known for easy installation and forming tight seals. Single Wall Venting: This stainless steel single wall flashing piece refers to the pipe not being insulated and at times hot to the touch but with the product being installed on the roof it is still the perfect choice for your water protection and tankless water heater venting needs. The angled roof flashing enables installation on slanted roofs to correctly cover the venting pipe and avoid moisture. 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. Features: For 5 ventilation systems High temperature rated stainless steel Provides water-tight roof penetrations for angled surfaces Introducing the latest advancements in tankless water heater technology for your home Noritz tankless hot water heaters are both eco-friendly and energy efficient providing savings up to 40% in utility costs. Their gas water heaters warm water on demand which means you ll always have hot water and it will never run out.