Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 820-4385031PC30 found under Seal Ring Nuclear Coolant System by Pressure Products Industries Inc. The National Stock Number assigned to this part is 4470012438790, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 820-4385031PC30.