Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3537 MOD ITEM 50 found under Adapter Manifold Ma by Cat Pumps Corp. The National Stock Number assigned to this part is 4310013003176, 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 3537 MOD ITEM 50.