The Vt4-S 4 in. diameter straight stainless steel terminating adds a professional and important component to your vent pipe termination. This straight bird screen termination helps protect your piping and tankless water heater from the elements while adding a strong durable component to a location susceptible to damage. N-Vent: Not only is the Noritz N-Vent easy to install and known for its tight seals, but it 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: High temperature rated stainless steel Easy to install Quick-snap connection Unique gasket enables tight seal 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.