Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18231 found under Guide Spring Valve by Eaton Aerospace Ltd. The National Stock Number assigned to this part is 2995011699486, and the Federal Supply Class is 2995 Miscellaneous Engine Accessories Aircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 18231.