Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VSF-6R 30T100PSI found under Valve Safety Relief by Ruthman Pump And Engineering Inc. The National Stock Number assigned to this part is 4820012849055, 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 VSF-6R 30T100PSI.