Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HB4-4FSA found under Adapter Straight Hose To Boss by Habco Incorporated. The National Stock Number assigned to this part is 4730015286734, 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 HB4-4FSA.