The Rinnai 550F-1351 is a genuine Back Spacer for Rinnai EnergySaver direct vent wall furnaces (confirm by model and serial number). Spacer that sets the furnace off the wall at the correct distance.
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.