Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81973-002 found under Switch Push by Evoqua Water Technologies Llc. The National Stock Number assigned to this part is 5930015739205, 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 81973-002.