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NOTE: For additional information, refer to the Defender Series° Overfill Prevention Valve <br /> Installation Guide. <br /> 1. Determine Dimension A: <br /> • Measure from bottom of the tank to the top of OPW face seal adaptor in the OPW spill <br /> container. <br /> 2. Determine Dimension X: <br /> • Measure required length for the upper drop tube from the non-flanged end. <br /> • Remove the flanged top. <br /> • Follow steps 3 to 16 in OPW 71SO Installation & Maintenance Instructions (H15524PA) <br /> referenced in Executive Order VR-102 to cut the upper drop tube and install the OPW <br /> inlet tube. <br /> 3. Remove the flanged top of the upper drop tube. <br /> X <br /> OPERATIONAL INSPECTION <br /> Use the FFS remote test tool to inspect the OPV. <br /> 1. Assemble the remote test tool with enough extension sections to reach the OPV. <br /> 2. Insert the remote test tool into the drop tube. You should feel a "pull" when the magnets <br /> are positioned correctly and attract. <br /> 3. Slowly raise the remote test tool about 1'/z" (38 mm). You should see the flapper move into <br /> the flow path. If you see the flapper moving back and forth, the OPV is functioning normally. <br /> 14 <br />