Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HELISEP500 OSPA0072 found under Switch Liquid Level by Seimi. The National Stock Number assigned to this part is 6680014400501, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HELISEP500 OSPA0072.