Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5260 found under Valve Check by Newdell Company The. The National Stock Number assigned to this part is 4820014148338, 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 5260.