The invention relates to a filter system, particularly for an internal combustion engine, comprising a filter element having a filter medium that in particular is folded in a star shape, the filter medium having a coaxial form, and having at least one end and sealing body that is made from an elastic potting compound and is disposed on a front of the filter medium. A first embodiment of the improved coupling incorporates a slidable coupling sleeve for piercing a frangible seal for providing liquid communication from the container to the pump. An isolated voltage is output from the high impedance power delivery network to components of a secondary side of the alternating current adaptor system. The two power input terminals are connected to the power cord. Since the SAV interval is normally programmed to an interval that is shorter than the intrinsic conduction time, ventricular pacing stimulus is provided after the SAV ends, thereby effectively restoring delivery of a ventricular pacing modality such as cardiac resynchronization therapy. The threads of the rod and threaded hole cause the second endpiece to move laterally along the threaded length of the rod when the second endpiece is rotated about the rod.