For non-condensing Rinnai tankless water heater installations, this 19.5-inch vent pipe extension is essential for proper venting. It is compatible with 3/5 concentric venting systems and ensures efficient exhaust of combustion gases. Made from durable materials, it weighs approximately 2.3 pounds, making it manageable for installation. This component is suitable for all indoor Rinnai water heater models, except for those in the R98 series, which require separate intake and exhaust systems.