Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 505-0-011 REV-B ITEM NO.3 found under Valve Linear Directional Control by Maritime Applied Physics Corporation. The National Stock Number assigned to this part is 4820016071198, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 505-0-011 REV-B ITEM NO.3.