Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3214-300 SET 300PSI found under Valve Safety Relief by Superior Valve Co. The National Stock Number assigned to this part is 4820013718806, 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 3214-300 SET 300PSI.