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STEP 18: LOWER TUBE ASSEMBLY STEP 20: PREPARE FILL RISER FOR VALVE If a vise is used, clamp on the valve body casting INSERTION only to avoid damage to the float and tubes. Thread the lower tube onto the valve body until the lower IMPORTANT: Inspect the riser pipe for any foreign tube bottoms out on valve body. Tube can be material. Over spray from tank relining or any tightened by hand or with a strap wrench. If a strap internal burrs inside of pipe must be removed prior wrench is used try to position it on the threaded to installation. Failure to have an unobstructed riser insert portion of the lower tube to prevent damaging pipe may prevent proper installation or operation of the tube. 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 Threaded insert matter interferes with smooth insertion of the valve, the riser pipe must be Figure 18 cleared. 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 WARNING tube with inflatable plumber's plugs. Apply a Failure to follow the maximum 10"W.C. (1/3 PSI)air pressure. If assembly and pressure does not hold and a leak can be located installation instructions with soap solution, do not install the valve. Send the or use of excessive valve back to OPW for warranty evaluation. force to insert the OPW Caution: Do not over-pressurize. Excess pressure 71 SO will VOID THE can damage the valve. WARRANTY! 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). Figure 22 Saw off the excess tube at a 45-degree angle or per Difficulty in removing the existing fill tube (if there is local codes or requirements and file off any sharp one) means there may be an obstruction in the riser burrs (Refer to Figure 24). Optional: Install the OPW pipe. Look for burrs, deformations, excess tank Tank Bottom Protector on the lower tube (Refer to lining material or other projections that may interfere Installation instructions supplied with the Tank with easy insertion of the OPW 71 SO. The 71 SO is Bottom Protector). designed for insertion into schedule 40 pipe. If schedule 80 pipe has been used for the riser, the IMPORTANT: Remove all chips and shavings out of 71 SO cannot be installed. If seamed pipe has been the cut end of the tube. DO NOT remove chips and used, the internal weld bead may interfere with the shavings by dumping thru valve body. OPW 71SO and prevent installation. If the OPW 71 SO 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. OPW 71 SO Overfill Prevention Valve Page 11