For Sebo Mechanical 300 and Mechanical 350 upright vacuum cleaners. Sebo exhaust hepa filter part 50169ER 

The SEBO 50169ER HEPA Exhaust Filter is designed to fit the SEBO 300 and 350 Mechanical Upright Vacuums. This filter is an upgrade from the filter that comes with the Mechanical Vacuums. This HEPA filter traps 99.9% of dust, dirt, and allergens down to 0.3 microns in size. It is recommended changing this filter every 6 to 12 months to keep your SEBO vacuum running at its peak performance 

Also fits Upright s2 Windsor Vacuum #86394540 (8.639-454.0)

Karcher CVU-30 CVU-36 CVU-46 HEPA Filter #86394540