Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1 18319 NAVY POS F 53 found under O Ring by Boll Filter Corporation. The National Stock Number assigned to this part is 5331013706910, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1 18319 NAVY POS F 53.