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STEP 3 : CUT THE UPPER DROP TUBE <br /> Attach the supplied band clamp to the upper tube <br /> just below the mark and ensure that it is assembled <br /> square to the tube . The clamp can be used as a <br /> guide for making a square cut. If a vise is used , <br /> clamp on the valve body casting only to avoid Band Clamp <br /> damage to the float and tubes (See Figure 3A) . <br /> Carefully saw through the tube squarely , at the mark <br /> made in Step 2 . Use a hacksaw with a new fine. <br /> tooth blade . Rotating the upper tube as the sawing <br /> progresses will minimize run out and ensure a <br /> square 90-degree cut . Remove the band clamp <br /> after tube is cut . <br /> CAUTION -DO NOT use a pipe or tubing cutter to <br /> cut the upper drop tube , this may damage the tube , Cut Line <br /> causing it to be out of round thereby prohibiting Figure 3B <br /> assembly of the unit. <br /> STEP 4 : FILE THE UPPER DROP TUBE <br /> IMPORTANT : Remove all chips and shavings File the upper tube square , and remove any burrs or <br /> generated in steps 3 thru 5 out of the cut end of the rough edges . Make sure the cut is flat and square . <br /> tube . DO NOT remove chips and shavings by <br /> dumping thru valve body . IMPORTANT : Carefully file a good chamfer on the <br /> inside edge of the drop tube to provide a lead -in for <br /> the polypak seal and inlet tube installed in step 8 . <br /> Fine half round file <br /> Figure 3A <br /> Figure 4 <br /> 66 <br />