Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 508 05 22 found under Piston Valve by Dynamic Controls Ltd. The National Stock Number assigned to this part is 4820016415823, 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 508 05 22.