Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 277 ITEM 11 found under Crankshaft Compressor by Cat Pumps Corp. The National Stock Number assigned to this part is 4310012997553, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 277 ITEM 11.