Abstract: Removable orifice defining members for improving conventional electrolytic cells of the type where fluid is fed into individual anode and cathode compartments by separate fluid supply headers. The removable orifice defining members are elongated and threadedly located in orifice receiving apertures extending through the headers and communicating with the individual anode and cathode compartments. The members each include an appropriate orifice extending generally longitudinally therethrough for properly metering fluid flow from the headers into the associated compartment. The orifice defining members may be conveniently installed or removed from outside the cell structure and separate end caps are also provided for conveniently closing the outermost ends of the orifice receiving apertures.

Abstract: A seal for preventing passage of fluid through an opening in an electrolytic cell wall through which a conductor for carrying electricity to or from a cell electrode passes includes as elements thereof a portion of the cell wall opening which is tapered so as to be larger at the outer part of the wall than at the inner part, silicone rubber in the narrower tapered opening part, an electrolyte-resistant rubber, such as neoprene, in the wider tapered opening part and means for pressing such rubber against the silicone rubber so as to help seal the silicone rubber against the tapered cell wall and the conductor. Preferably, the seal is a gas-tight seal and prevents hydrogen from escaping into the atmosphere from the catholyte compartment of an electrolytic cell for the electrolysis of brine.