Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2S973-5-7 found under Seat Valve by Anchor Darling Actuator Co. The National Stock Number assigned to this part is 4820008682982, 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 2S973-5-7.