Abstract: A novel housing structure for a high voltage power supply results in an easily replaceable electrical high voltage bushing. In this an elongated electrode is attached at an end to a support member and extends through an opening in a boundary plate, which is spaced from and supports said support member, and a hollow elongated electrical insulator, the "bushing," ensleeves said electrode and extends through said boundary plate opening to said insulating support means. A film coating is provided on the electrode and a like film coating is provided on the elongated insulator. The voids within the housing are filled with conventional "potting" material. The film coatings are moisture impervious to serve as moisture barriers and are indissoluble in, essentially, and nonadhesive with the potting material to allow detachment of the bushing.