Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NDC00049-0520-83 found under Penicillin G Potass by Pfizer Inc. The National Stock Number assigned to this part is 6505014459244, 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 NDC00049-0520-83.