Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PFR-561 found under Refrigeration Unit Mechanical by Klinge Corporation. The National Stock Number assigned to this part is 4110015486380, and the Federal Supply Class is 4110 Refrigeration Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PFR-561.