Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1665-61667 found under Extension Valve by S And L Aerospace Metals Llc. The National Stock Number assigned to this part is 1650005662428, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S1665-61667.