The Karcher 64221150 air filter is an essential component for Karcher NT series dry vacuum cleaners, including models like NT 35/1 Tact, NT 40/1 Tact, NT 45/1 Tact, NT 50/1 Tact Te, NT 55/1 Tact, NT 65/2 Tact2, and NT 75/2 Tact2. This genuine OEM filter ensures efficient dust collection and protects the vacuum's motor, maintaining optimal performance and extending equipment lifespan. With an outer diameter of 184.2 mm, an inner diameter of 136.9 mm, and a length of 200.7 mm, it provides a precise fit. It is also known to cross-reference with aftermarket part Donaldson P822769.