Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CS4320-0034 found under Ring Wearing by Precision Products Co. The National Stock Number assigned to this part is 4320002640772, and the Federal Supply Class is 4320 Power And Hand Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CS4320-0034.