The Rinnai 229013NPP is a genuine 2 and 4 Inch Condensing Horizontal Termination Kit, 21 inch for Rinnai condensing boilers and tankless water heaters. Horizontal wall termination for 2 or 4 inch PP concentric venting on Rinnai condensing appliances, 21 inch length.
This is an OEM Rinnai part, so it fits and performs the way the original did. Confirm your model before ordering; the model is on the rating label on the unit. If you are not sure which part you need, Rural Energy support can check it against your model and serial number.
Rural Energy is a Rinnai distributor and keeps Rinnai boiler and water heater venting parts in stock for fast shipping to dealers, contractors, and homeowners.