Noritz Concentric N-Vent Is Approved For Use With Noritz Dvc Tankless Series Exhaust Installations At A Fraction Of The Industry Standard Cost. Noritz Supplies Easy-To-Connect Venting Components Without The Need To Tighten As It Has A Quick-Snap Feature That Allows For An Easy Connection While Forming A Tight Seal. Push-On Connection Single-Wall Penetration No Need To Cut - Adjustable For Easy Installation Zero Clearance To Combustibles Use Of Superior Anti-Corrosion Material For Outlet Port Heat And Chemical Resistant Rubber O-Ring For Secure Sealing Superior Design For All Noritz Dvc Heater Series