NOVELTY - An electrochemical system (20) includes at least two cells with anolyte and catholyte chambers, electrode plates, anolyte and catholyte chambers separator (36) with at least a peripheral frame, and anolyte and catholyte frames (38, 40). The peripheral frame is bonded in direct abutment with the anolyte and catholyte frames.    USE - For producing hydrogen and oxygen.    ADVANTAGE - The assembly reduces or eliminates fluid leakage. It enables an entire cell block to be encapsulated with elastomeric material to render the edges of the block to be hermetic and leak tight for both oxygen and hydrogen gases and electrolyte.    DETAILED DESCRIPTION - An improved electrochemical system includes at least two cells with an anolyte and a catholyte chamber, unitary one piece double electrode plate(s) (DEP) (110), at least two single electrode plates, a separator between the catholyte and anolyte chambers, and anolyte and catholyte frames. Anode and cathode (30) electrodes are adjacent to the anolyte and catholyte chambers, respectively. The electrode plates have electrically conducting frames. The anode and cathode electrodes are supported on portions of the conducting frame. The electrode plates include at least opposed faces, each of which includes a planar peripheral surface extending about a periphery of the supported electrodes. The separator has at least a peripheral frame formed of a compressible elastomer. The anolyte and catholyte frames are formed of a compressible elastomer, and are compressed to form fluid tight seals when the electrochemical system is assembled. The peripheral frame is bonded in direct abutment with the anolyte and catholyte frames.    DESCRIPTION OF DRAWING(S) - The figure is an exploded perspective view of the multiple stack electrochemical system consisting of the series connection of four stacks consisting of two cells each connected in parallel.    Electrochemical system (20)    Stacks (22)    Cathodes (30)    Chamber separator (36)    Anolyte frame (38)    Catholyte frame (40)    Insulating panels (54)    DEP (110)