Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31 172-193 found under Diaphragm Valve Fla by Graco Inc. The National Stock Number assigned to this part is 4820016145018, 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 31 172-193.