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OPW Overfill Prevention-EVR <br /> The OPW 61 SO-40OC-EVR series Overfill Prevention Valves are certified for <br /> installation on OPW Phase 1 EVR Systems. The vapor-tight EVR 6ISO's are designed to <br /> provide positive shut-off of product delivery before an overfill condition occurs per EPA <br /> requirements without intervention from the transport driver. The valve features a sealed <br /> float pivot and a threaded lower tube connection and exceeds the EVR requirement for a <br /> maximum vapor leak rate of 0.17CFH@2"HZO. The 61 SO-EVR series valve is installed <br /> 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 <br /> the drop tube thereby isolating the drain valve from the tank ullage, eliminating a <br /> notorious leak point in previous systems. <br /> OPW Overfill Prevention-EVR <br />