Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 491742 found under Housing Control Pis by The Birken Manufacturing Company. The National Stock Number assigned to this part is 2995009196246, 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 491742.