Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 185-5542 found under Cap Valve Stem by Onan Corp. The National Stock Number assigned to this part is 2815016205231, and the Federal Supply Class is 2815 Diesel Engines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 185-5542.