Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 083-4439 found under Cap Pneumatic Valve by Marathon Le Tourneau Co. The National Stock Number assigned to this part is 2640002672982, and the Federal Supply Class is 2640 Tire Rebuilding And Tire And Tube Repair Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 083-4439.