Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST50-F-B ITEM NO 2 found under Strainer Element Se by Mechanical Marine Div Hayward Mfg. The National Stock Number assigned to this part is 4730013826636, 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 ST50-F-B ITEM NO 2.