The Toyotomi 17185330 is a genuine Fuel Line Insert Cap Nut for NS2800, NS2700, NS1750. Cap nut with insert that seals the copper fuel line at the heater fitting on the NS-series heaters. Replace when the joint weeps fuel after tightening.
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.