Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PX 9000 A found under Valve Rotary Select by Twin Disc Incorporated. The National Stock Number assigned to this part is 4810015008854, 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 PX 9000 A.