Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number N7500-27 found under Cover Filter Fit Check by North Safety Products L L C. The National Stock Number assigned to this part is 4240012513230, and the Federal Supply Class is 4240 Safety And Rescue Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like N7500-27.