Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GT8.7503 found under Disk Valve by Southwest Stainless Lp. The National Stock Number assigned to this part is 4820015659292, 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 GT8.7503.