Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PLC-10139 ITEM 4 found under Seat Valve by Admiral Valve Llc. The National Stock Number assigned to this part is 4820011624368, 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 PLC-10139 ITEM 4.