The F design with flanges DN15 and DN50 (vacuum-proof, pressure-resistant up to 10 bar) Magnetic stirrer couplings with flanges DN 15 or DN 50 are intended in particular for use on glass reactors, thin film evaporators and extraction columns. This design is not only vacuum-proof but can also be used for applications with overpressure of up to 10 bar. Standard flat gaskets, e.g. made of PTFE, can be selected as seals. Variants in special materials such as Hastelloy C22, C276, B3 are available on request. Other flange sizes and systems such as KF and TriClamp can also be realised.