The Toyotomi 17185357 is a genuine Elbow Joint Pipe NSP-507 for NS2700, NS2800. Elbow joint pipe that turns the vent run at the back of the NS2700 and NS2800. Replace when corroded or when the joint no longer seals.
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 NS-series heater parts in stock for fast shipping to dealers and homeowners.