This filter is suitable for lots of different models, not just the A2004 as indicated in the title. In packaging, Karcher also provided the immobilization lock is convenient when we lost by emptying the vacuum cleaner. This filter can be 'rejuvenated' by cleaning with compressed air, when it was heavily contaminated by fine dust (plaster for example). It's also nice to find on Amazon accessories such as this one, at the right price. Super fast, perfect service delivery.