Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P6378 found under Retainer Oil Seal by Koehring Co. The National Stock Number assigned to this part is 2590008768703, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P6378.