Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 709 3 8NPT found under Valve Check by Ernst Flow Industries Inc. The National Stock Number assigned to this part is 4820011922899, 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 709 3 8NPT.