Abstract: A current responsive, gas-actuated bushing plug connector, for use with elbow connectors having a male electrode extending therefrom, is disclosed. The bushing plug includes an elastomeric housing in which a cylindrical, silver-plated insert body is coaxially mounted. The axially inner end of the insert body includes a threaded fastener for connection to an external circuit, and is thereby terminated to provide an enclosed chamber which opens at the other end of the insert body toward the mouth of the bushing plug. A removable and generally cylindrical piston assembly is slidably and coaxially mounted within the insert body. The removable assembly includes a metallic piston member having an annular piston head facing the inner end of the insert body and which encloses the chamber except at the axial bore of the piston member.