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The FSA-400 Threaded Riser Face Seal Adaptor is installed on the fill pipe below the spill container to provide <br />a true sealing surface for the drop tube flange on the 61 SO-EVR overfill prevention valve. The 61 SO-EVR <br />series valve is installed in the base of the OPW EVR spill container with the patent pending 61JSK Jack Screw <br />device. This configuration allows liquid in the spill container to be drained directly into the drop tube thereby <br />isolating the drain valve from the tank ullage, eliminating a notorious leak point in previous systems. <br />