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5) Dipstick number (X) = 82" Tank diameter (Y) = 92" (Y) - (X) = (Z) (92" - 82 = 10") (Z) = 10" 6) (Z) -2"=C (10"-2"=8") C=8" 7) Is 8" less than 6-1/2"? NO Measure the distance from the top of the 400 Face Face Seal Adaptor installed on the riser pipe to the inside, top lip of the storage tank and ob- tain measurement (A). Upper tube length = C + (A) For testable models only, ending in "T": Upper Tube Length = C + (A) - 1-1 /2" ASSEMBLY INSTRUCTIONS IMPORTANT: Each of the numbered steps in the instal- lation instructions are designed as a CHECK LIST to en- sure proper installation and trouble free operation of the OPW 71 SO Overfill Prevention Valve. Read and follow these steps carefully, checking them off as you proceed. Figure numbers correspond to step numbers for easy reference. STEP 1: MEASURE Install the OPW Face Seal Adaptor and the OPWThread- on Spill Container on the Fill Riser (Refer to the Installa- tion Instructions Supplied with the Spill Container). In- sert a tape measure through the riser pipe and hook it under the inside of the tank in the lengthwise direction. Measure the distance from the top of the Face Seal Adaptor threads inside the base of the spill container bucket just below the drain valve outlet window to the inside, top lip of the storage tank (Dim. "A") (See Figure 1 &1A). The top flange on the 71 SO will rest on the Face Seal Adaptor just below the drain valve outlet, and be locked in place between the Face Seal Adaptor and the 4" nipple that is installed in the spill container with the Jack Screw Kit (See Figure 1A). (For riser pipe configu- rations other than that shown, consult installation drawings or use other necessary means to measure Di- mension "A"). Using a tape measure, measure the distance from the top of the Face Seal Adaptor in the spill container to the bottom of the tank (Dim. "B"). IMPORTANT: Inspect the riser pipe for any foreign ma- terial. Over spray from tank relining or any internal burrs inside of pipe must be removed prior to installa- tion. Failure to have an unobstructed riser pipe may prevent proper installation and operation of the valve. The 71 SO is designed for installation into schedule 40 riser pipes. The 71 SO cannot be installed into schedule 80 riser pipes. STEP 2: MARKTHETUBE Use the result from Step 1 and HOW TO LOCATE THE POSITION OF THE 71 SO AT 95% TANK CAPACITY to mark the upper tube. Measure the distance from the seam where the upper tube and valve body meet. Use a tape measure to mark the calculated upper tube length onto the upper tube. See Figure 2. Tape measure Riser Pipe with Face (A) Seal Adaptor To Tank (B) Top (I.D.) To Tank Bottom Figure 1 Figure 1A 5