1. IN AN INDUCTIVE HEATING DEVICE A DETACHABLE CONNECTING MEANS FOR COOLING AGENTS AND CURRENT SUPPLY COMPRISING AN INDUCTOR HAVING AN END PROVIDED WITH A CURRENT CONTACT MEMBER AND A COOLING WATER SUPPLY MEANS, A BORED CONTACT BLOCK, A PRESSURE SCREW THREADED THROUGH SAID CONTACT BLOCK FOR APPLYING PRESSURE TO SAID CONTACT MEMBER TO CAUSE THE LATTER TO ENGAGE THE CONTACT BLOCK WITH THE DESIRED PRESSURE, SAID COOLING WATER SUPPLY MEANS PROVIDED WITH A NIPPLE AND A FLEXIBLE SEALING RING ON SAID CONTACT MEMBER, A WATER-TIGHT STOP FOR THE BORE IN SAID CONTACT BLOCK AND FORMING A CHAMBER THEREBETWEEN, SAID