[en] The invention claims a bushing rated for elevated temperatures and pressures designed for letting out the electric signal from the closed pressure vessel. Currently used bushings do not allow their use at high operating temperatures and pressures in liquid metal, vapour or other media. The designed bushing is intended for use as a contact level gauge for measuring the level of liquid metal in installations using liquid metal, namely in nuclear power plants. The bushings may also be used as leakage indicators or as sensors for accident protection. (F.M.)