Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RB90-4IN-700PSI found under Disk Rupturable by Bs And B Safety Systems Llc. The National Stock Number assigned to this part is 4820011979770, 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 RB90-4IN-700PSI.