Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 70-31638-4000 found under Indicator Rate Of Flow by Halliburton Services. The National Stock Number assigned to this part is 6680013392511, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 70-31638-4000.