Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FRIGITRON 2000 found under Air Conditioner Respirator by E D Bullard Company. The National Stock Number assigned to this part is 4240013649480, 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 FRIGITRON 2000.