Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BM7648 ITEM 5 found under O Ring by Pcc Valves And Controls. The National Stock Number assigned to this part is 5331011918041, 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 BM7648 ITEM 5.