Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2522 found under Cock Shutoff Screw Stem by Tobul Accumulator Incorporated. The National Stock Number assigned to this part is 4820012343186, 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 2522.