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MAINTENANCE <br /> The OPV has no periodic maintenance requirements, but if you remove the drop tube and OPV <br /> assembly from the tank, inspect the drop tube seal for wear or damage. Replace it if necessary. <br /> Drop tube gasket <br /> (note orientation) <br /> Also, if you remove the upper or lower drop tube from the OPV, you should replace the 0-ring(s). <br /> Inspect O-ring <br /> Inspect O-ring <br /> 16 <br /> t., (-, (` <br />