Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1508-1 REV B ITEM 30 found under Valve Expansion by Adrick Marine Group Inc. The National Stock Number assigned to this part is 4820014453140, 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 1508-1 REV B ITEM 30.