Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MA-88-81 found under Guaifenesin Syrup U by U S Dept Of Veterans Affairs. The National Stock Number assigned to this part is 6505010599007, 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 MA-88-81.