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N <br /> Inspect and verify the final shutoff level <br /> NOTE: When you perform this procedure, do not remove the OPV assembly from the tank. <br /> r — — — — — — — — — Seat surface of upper drop tube <br /> I I I I <br /> Upper Drop Tube <br /> Measure <br /> 1 1 A--Final shutoff volume" <br /> I I L _ J <br /> I I <br /> Overfill Prevention Valve <br /> I I <br /> 1 I <br /> (U.s.T.) <br /> 4'/:" <br /> (114 mm) <br /> I 1 <br /> I � I <br /> L — — — — — — — — — J <br /> Bottom of Tank Not to Scale <br /> 16 <br />