Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18857 found under Head Fluid Filter by Gse Holdings Inc. The National Stock Number assigned to this part is 2945015176099, and the Federal Supply Class is 2945 Engine Air And Oil Filters Cleaners Aircraft Prime Moving. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 18857.