Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number YZ250263 found under Valve Safety Relief by Funk Mfg Co. The National Stock Number assigned to this part is 4820012677850, 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 YZ250263.