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Features <br />The FSA -400 Threaded Riser Face Seal Adaptor is installed on the fill pipe below the <br />spill container to provide a true sealing surface for the drop tube flange on the 61 SO- <br />EVR overfill prevention valve. The 61 SO-EVR series valve is installed in the base of the <br />OPW EVR spill container with the patent pending 61JSK Jack Screw device. This <br />configuration allows liquid in the spill container to be drained directly into the drop tube <br />thereby isolating the drain valve from the tank ullage, eliminating a notorious leak point <br />in previous systems. <br />Ordering Specifications <br />Part No. Description <br />OPW FSA -400 4" Face Seal Adaptor <br />OPW FSA -400-S 4" Short Face Seal Adaptor for Case Iron Base Only <br />