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STEP 3: CUT THE UPPER DROP TUBE <br /> Attach the supplied band clamp to the upper tube STEP 4: FILE THE UPPER DROP TUBE <br /> just below the mark and ensure that it is assembled File the upper tube square, and remove any burrs or <br /> square to the tube. The clamp can be used as a rough edges. Make sure the cut is flat and square. <br /> guide for making a square cut. If a vise is used, <br /> clamp on the valve body casting only to avoid IMPORTANT: Carefully file a good chamfer on the <br /> damage to the float and tubes(See Figure 3A). inside edge of the drop tube to provide a lead-in for <br /> Carefully saw through the tube squarely, at the mark the polypak seal and inlet tube installed in step 8. <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, <br /> causing it to be out of round thereby prohibiting <br /> assembly of the unit. <br /> IMPORTANT: Remove all chips and shavings <br /> generated in steps 3 thru 5 out of the cut end of the <br /> tube. DO NOT remove chips and shavings by Fine half round file <br /> dumping thru valve body. <br /> Figure 4 <br /> STEP 5: SAND THE UPPER DROP TUBE <br /> Sand the inside of the drop tube with sandpaper <br /> and/or steel wool to remove all burrs and sharp <br /> edges. After sanding wipe down the inside of the <br /> tube with a clean rag from the top to approximately 4 <br /> inches down to remove any debris. <br /> Caution: Failure to properly chamfer,sand,and <br /> clean the drop tube may cut the seal and result <br /> In a failure of a pressure decay leak test. <br /> Figure 3A <br /> Band Clamp <br /> Fine grit sandpaper <br /> Figure 5 <br /> Cut Line <br /> Figure 3B <br /> OPW 71 SO Overfill Prevention Valve Page 6 <br />