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r <br /> 4 <br /> \1 <br /> Groove <br /> Witness lines or marks <br /> 9. Repeat the previous three steps to create a groove over the second mark. <br /> Witness lines or marks <br /> — Second groove <br /> Complete the installation <br /> Before you install the OPV, remove any burrs and clean the inside of the tank riser pipe properly. <br /> If you do not, the OPV might be damaged or unable to function properly. <br /> NOTE: The upper and lower threads of the drop tube adapters are lubricated at the factory. <br /> Do not use pipe sealant. Make sure the 0-rings on both ends of the OPV are present and <br /> undamaged. <br /> 11 <br />