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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 />1. Check the float and flapper mechanism by rotating the outer coupler counter -clockwise. <br />Make sure this activates the internal flapper and operates smoothly. <br />Outer coupler <br />2. Make sure the drop tube gasket is installed under the upper drop tube flange. (See step 3 of <br />"Install the upper drop tube adapter.") <br />3. Thread the upper and lower drop tubes onto the OPV, and then use strap wrenches (not <br />pipe wrenches) to tighten the drop tubes. Position one on the upper drop tube, and the <br />other on the lower drop tube. Do not tighten the float shield or valve. <br />