Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL 8201-006 ITEM NO 22 found under Valve Check by Cs Controls Incorporated. The National Stock Number assigned to this part is 4820014108130, 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 PL 8201-006 ITEM NO 22.