Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PESK 4140 found under Valve Bleeder Hydra by United States Department Of The Navy. The National Stock Number assigned to this part is 4820145204968, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PESK 4140.