Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DC5040 found under Climate Control Dual Cool Respir by E D Bullard Company. The National Stock Number assigned to this part is 4240014348287, 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 DC5040.