Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GSS 1793UK found under Piston Valve by Austin Hardware Inc. The National Stock Number assigned to this part is 4820016714777, 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 GSS 1793UK.