Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 881239 found under Parts Kit Valve by Watts Regulator Co. The National Stock Number assigned to this part is 4820013703666, 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 881239.