General description Set of 2x filter elements compatible with Nilfisk Alto Wap 550-21, 550-31, and 590-31 battery-powered vacuum cleaners. These high-quality filters are designed for both dry and wet vacuuming, making them ideal for cleaning wet rooms. They effectively trap dust and tiny dirt particles, ensuring efficient suction power. Technical specifications Height: 12 cm Outer diameter: 18 cm Inner diameter: 13.4 cm Form: round Weight: 253 g Colour: white / blue Washable Compatibility and accessories Compatible with Nilfisk Alto Wap 550-21 Compatible with Nilfisk Alto Wap 550-31 Compatible with Nilfisk Alto Wap 590-31 Replacement for W29747, R640, 488461, 29747 Usage Change the filters regularly to ensure optimum suction performance and to extend the service life of your vacuum cleaner motor. They have been designed for easy installation and removal.