Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8C250S found under Valve Stop Check by Engineered Cooling Systems Inc. The National Stock Number assigned to this part is 4820013667125, 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 8C250S.