The Toyotomi 20476424 is a genuine Type B Water Supply Pipe, 370 mm for BS-36UFF, OM-148. 370 mm cold water supply pipe to the heat exchanger.
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.