Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0020787 found under Disk Valve by Griswold Pump Co. The National Stock Number assigned to this part is 4820009836519, 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 0020787.