Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BULTN 4187-381 found under Seal Nut Pipe by Miller Fluid Power Corporation. The National Stock Number assigned to this part is 4730012267361, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BULTN 4187-381.