Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2568 found under Valve Vent by Nellcor Puritan Bennett Incorpor. The National Stock Number assigned to this part is 4820010767460, 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 2568.