SUPER 1968 dual relief valve manifold meets the requirements of ANSI/ASHRAE15-1994 safety code for mechanical refrigeration (pressure vessels having 10 cubic feet or more of internal gross volume shall be fitted with dual pressure relief valve). On this dual manifold, 2 safety valves are installed, out of which only 1 valve remains operational at a time, while the other is being replaced, eliminating the need to remove refrigerant from the vessel.