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Tape measure Figure 2 Seam Mark Upper Tube (Cut Line) STEP 3: CUT THE UPPER DROP TUBE Attach the supplied band clamp to the upper tube just below the mark and ensure that it is assembled square to the tube. The clamp can be used as a guide for mak- ing a square cut. If a vise is used, clamp on the valve body casting only to avoid damage to the float and tubes (See Figure 3A). Carefully saw through the tube squarely, at the mark made in Step 2. Use a hacksaw with a new fine-tooth blade. Rotating the upper tube as the sawing progresses will minimize run out and en- sure a square 90 -degree cut. Remove the band clamp after tube is cut. CAUTION - DO NOT use a pipe or tubing cutter to cut the upper drop tube, this may damage the tube, causing it to be out of round thereby prohibiting assembly of the unit. Figure sH Figure 38 IMPORTANT: Remove all chips and shavings generated insteps 3 thru 5 out of the cut end of the tube. DO NOT remove chips and shavings by dumping thru valve body. STEP 4: FILE THE UPPER DROP TUBE File the upper tube square, and remove any burrs or rough edges. Make sure the cut is flat and square. IMPORTANT: Carefully file a good chamfer on the in- side edge of the drop tube to provide a lead-in for the polypak seal and inlet tube installed in Step 8. Figure 4 STEP 5: SAND THE UPPER DROP TUBE Sand the inside of the drop tube with sandpaper and/or steel wool to remove all burrs and sharp edges. After sanding wipe down the inside of the tube with a clean rag from the top to approximately 4 inches down to remove any debris. Caution: Failure to properly chamfer, sand, and clean the drop tube may cut the seal and result in a failure of a pressure decay leak test. Figure 5