I bought the filter for wet-dry vacuum cleaner (Parkside PNTS 1500) of LIDL. Unfortunately, it is the original filter not easily replace these. The original filter is open at both ends and is supported by a base plate with bolt. This filter, however, is closed at the bottom by a secured to the filter plate and plastic can not be locked to the air intake in this state. Although he holds so if you put it on the recording, falls during transport of the vacuum cleaner but then relatively easily. If the filters are locked to the vacuum cleaner, ie the recess for the bolt in the bottom of the filter only has to be cut. Caution is warranted, as the plastic used is quite brittle and breaks easily. If the filter has been adjusted as described, but he does a good job.