Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18-4458 found under Cap Assembly Protective Muffler by Paxton Company. The National Stock Number assigned to this part is 2990015886228, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 18-4458.