Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81881 ITEM 67 found under Valve Purge by Evoqua Water Technologies Llc. The National Stock Number assigned to this part is 4820014937940, 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 81881 ITEM 67.