Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3P525B REF 7 found under Seal Seat by W W Grainger Inc. The National Stock Number assigned to this part is 5330012107342, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3P525B REF 7.