Guillemin couplings are manufactured to a French standard so it is often called French type couplings. It is suitable for transferring and conveying power and granule on tanker fleets. Also this kind of Guillemin coupling has an identical locking head, that is to say there is no difference between the male and the female half. Thereby it is also called symmetric type fittings or couplings. Guillemin couplings are available in standard materials of aluminum and also can be customized in brass or stainless steel and NBR seals.