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16 <br />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 />t., (-, (` <br />