Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 863369 ITEM 4 found under Valve Safety Relief by Aircraft Appliances And Equipmen. The National Stock Number assigned to this part is 4820200047864, 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 863369 ITEM 4.