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