Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NP-187-1 found under Cap Valve by Argo Turboserve Corporation. The National Stock Number assigned to this part is 4820013014475, 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 NP-187-1.