Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 45-90-134 found under Leak Detector Refrigerant Gas by Societe Etudes. The National Stock Number assigned to this part is 4940011020455, 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 45-90-134.