Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 23H0019-3 found under Seat Valve by Computer Machining Technology Co. The National Stock Number assigned to this part is 4820002261982, 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 23H0019-3.