Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P52-1658 found under Breather Filter Emi by Donaldson Co Inc. The National Stock Number assigned to this part is 2990012859666, 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 P52-1658.