This compact Wet and Dry Dust Extractor features an innovative dual filter cleaning system that maintains performance during tough applications and is L Classified to meet EU legislation.Providing constant suction power even with the finest concrete and wood dust, this Extractor\'s filter is automatically cleaned every 30 seconds to minimise filter clogging and to deliver a constant air flow.The DWV901 continues to run for an extra 15 seconds to allow all dust to be cleared from system and includes a durable tank construction suitable for tough wet and dry jobsite applications. It is fitted with a built-in power take off socket that allows a power tool to be connected for automatic switching of the vacuum system, when the power tool is operated.