Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ZOSYN 4.5GM found under Piperacillin And Ta by Pfizer Inc. The National Stock Number assigned to this part is 6505015412276, 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 ZOSYN 4.5GM.