Device, method and system for substantially simultaneous injection of air or sealant into a borehole resulting from extraction of a sampling assembly from a formation. The combination effect coat is produced by the application and curing of a pigmented powder slurry wherein the pigmented powder slurry is curable thermally, or curable thermally and with actinic radiation. The pressure differential is between an insufflation gas pressure and an initial pressure lower than the insufflation gas pressure. When the internal pressure of the ink tank becomes smaller than that of outside atmosphere by a first predetermined pressure or more, the first check valve is switched into an open state to connect the outside atmosphere and the ink tank. The at least one divertor plate and current carrying conductors are configured relative to one another such that the current carrying conductors expand the open magnetic field lines at the divertor plate. In a second method, the valve body and its inlet connection are injection-molded as separate parts in a first process step, and in a second process step, the inlet connection, with a screw cap slipped onto it, is welded onto the valve body.