The Toyotomi 20476408 is a genuine Flue Pipe Smoke Test Hole Gasket for BS-36UFF, OM-148, OM-180. Seals the smoke test port on the flue pipe. Replace it after combustion testing so the flue stays sealed.
This is an OEM Toyotomi part, so it fits and performs the way the original did. Confirm your heater 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 Toyotomi distributor and keeps Oil Miser water heater parts in stock for fast shipping to dealers and homeowners.