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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 s valve back to OPW for warranty evaluation . force to insert the OPW Caution : Do not over-pressurize . Excess pressure 71SO 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 71SO . The 71SO 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 71SO 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 71 SO 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 . i 71