A. The Toyotomi 17185362 Nut C3 is a genuine OEM replacement fastening nut used on several Toyotomi oil heaters and direct-vent heating systems, including the OM-180, OM-148, BS36UFF, NS2800, and Laser 30B.
This hardware component is designed to secure designated assemblies within compatible Toyotomi heaters. Although it is a small part, using the correct OEM nut helps maintain the original assembly and ensures components remain securely fastened during normal operation.
For routine maintenance or repairs, replacing damaged or missing hardware with the specified Toyotomi part helps preserve factory fit and reliability.