The Sanitaire 15943-2 motor change kit is designed for replacing the 5-amp motor on select Sanitaire commercial upright vacuums. Compatible models include SC679JGS, SC679J-1, SC679J-2, SC679JGS-1, SC678A, SC689A, SC689A-1, and SC689A-2. Motor replacement restores full suction and airflow performance to units with failed or worn motors.