The Rinnai 556F-203-2X01 is a genuine Manifold Packing for 556FA. Gasket that seals the burner manifold. Install a new packing any time the manifold is removed.
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 direct vent wall furnace parts in stock for fast shipping to dealers, contractors, and homeowners.