the invention relates generally to oil and gas exploration and production and , more particularly , to a system and associated method for producing hydrocarbons from multiple layers of subterranean formations , and the mixing or comingling of such hydrocarbons as necessary or desired during the production process . a subterranean tool is disclosed , having a plurality of tubular sections connected by a novel non - threaded linear connection system . an electrical passage can then be provided within the cylinder wall of contiguous sections permitting connection of electronics in different sections of the tool . bushings and seals located in the electrical passage maintain an atmospheric pressure environment for electrical components inside the tool .