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qqq%WA <br /> Witness lines or marks <br /> Second groove <br /> r <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 /> �? v <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 /> 0,dgwoo <br /> -.owed do <br />