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• Suitable for Vacuum filtration, Solvent purification, Solid-Phase Extraction (SPE), Gel electrophoresis • All wetted parts of the Pump in contact with air are made of PTFE material which can resist most of corrosive gases • Without the need of lubrifiant, regular oil changes and maintenance; with no oil pollution • Built-in thermal protection device to shut off the pump automatically when overheated and then resume working when the temperature cools down • The Chemker 411 pump is equipped with a moisture trap and a valve for vacuum adjustment