of the present invention are of the type which are suitable for use in downhole equipment thus capable of withstanding high pressures and elevated temperatures the o rings and other rubber articles used in the present invention are made for example from heat resistant rubber material known under the trade names viton or buna the metal parts of the rotatable electrical connector of the invention are generally speaking made of stainless steel suitable for use in downhole applications except for such parts the material of which is specifically described here the mandrel 38 extends downwardly from the female connector set 34 and enters a sealed chamber which includes a cylindrical upper housing body 42 sealed on its top with a threaded cap 44 as it is described below oil suitable for downhole application for example capella oil or aeroshell turbine oil 555 from shell oil co fills the chamber under such pressure which is substantially equal to the outside hydrostatic pressure o rings 40 and rotary seals 46 prevent leakage of fluids from one side of the respective seals to the other side the mandrel 38 is rotatably mounted within the housing by ball bearings 48 and radial bearings 50 a metal spacer 51 is provided between radial bearings 50 a shaft or conductor rod 52 made of highly conductive material such as bronze is located.