Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81972-002 found under Switch Rotary by Evoqua Water Technologies Llc. The National Stock Number assigned to this part is 5930015079369, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 81972-002.