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STEP 18: LOWER TUBE ASSEMBLY If a vise is used, clamp on the valve body casting only to avoid damage to the float and tubes. Thread the lower tube onto the valve body until the lower tube bottoms out on valve body. Tube can be tightened by hand or with a strap wrench. If a strap wrench is used try to position it on the threaded insert portion of the lower tube to prevent damaging the tube. Threaded insert Figure 18 71 Note: Before installing the valve in the tank, a pressure test can be performed on the valve to check for vapor tightness. Seal off both ends of the tube with inflatable plumber’s plugs. Apply a maximum 10" W.C. (1/3 PSI) air pressure. If pressure does not hold and a leak can be located with soap solution, do not install the valve. Send the valve back to OPW for warranty evaluation. Caution: Do not over-pressurize. Excess pressure can damage the valve. STEP 19: CUT LOWER TUBE Measuring from the underside of the inlet tube flange, mark the overall length of the drop tube a distance of (B) minus 6". Determine dimension (B) from the measurements taken in Step 1, Figure 1 (Top of the Face Seal Adapter below the drain valve outlet in the spill container to the bottom of the tank). Saw off the excess tube at a 45-degree angle or per local codes or requirements and file off any sharp burrs (Refer to Figure 24). Optional: Install the OPW Tank Bottom Protector on the lower tube (Refer to Installation instructions supplied with the Tank Bottom Protector). IMPORTANT: Remove all chips and shavings out of the cut end of the tube. DO NOT remove chips and shavings by dumping thru valve body. STEP 20: PREPARE FILL RISER FOR VALVE INSERTION IMPORTANT: Inspect the riser pipe for any foreign material. Over spray from tank relining or any internal burrs inside of pipe must be removed prior to installation. Failure to have an unobstructed riser pipe may prevent proper installation or operation of the valve. Thoroughly clean top of riser pipe. STEP 21: REMOVE ELASTIC BAND Remove the elastic band securing the float to the valve body. The float will move into an outward position. STEP 22: INSERT DROP TUBE Make sure the upper O-Ring gasket is under the flange of the inlet tube. Hold the float down against the valve body and slowly insert the drop tube overfill valve into the riser pipe. Do not force valve into the riser pipe. If any obstruction or foreign matter interferes with smooth insertion of the valve, the riser pipe must be cleared. WARNING Failure to follow the assembly and installation instructions or use of excessive force to insert the OPW 71SO will VOID THE WARRANTY! Figure 22 Difficulty in removing the existing fill tube (if there is one) means there may be an obstruction in the riser pipe. Look for burrs, deformations, excess tank lining material or other projections that may interfere with easy insertion of the OPW 71SO. The 71SO is designed for insertion into schedule 40 pipe. If schedule 80 pipe has been used for the riser, the 71SO cannot be installed. If seamed pipe has been used, the internal weld bead may interfere with the OPW 71SO and prevent installation. If the OPW 71SO won’t slip in easily DON’T FORCE IT! Damage to the valve may result if excess force is used. Examine the riser pipe carefully; determine the nature of the obstruction; take appropriate steps to remove it.