Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50012-4-S found under Saturable Reactor by Evoqua Water Technologies Llc. The National Stock Number assigned to this part is 5950011264604, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 50012-4-S.