Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 13139 found under Seat Valve by Mcneil Ohio Corp. The National Stock Number assigned to this part is 4820012303680, 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 13139.