Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2173B8907W found under Valve Solenoid by Ross Operating Valve Co. The National Stock Number assigned to this part is 4810016137798, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2173B8907W.