Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 72R-5300 found under Valve Regulating System Pressure by Red Dot Corporation. The National Stock Number assigned to this part is 4820012677781, 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 72R-5300.