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ASSEMBLY INSTRUCTIONS Measuring Stick IMPORTANT: Each of the numbered steps in the installation instructions are designed as a CHECK LIST to ensure proper installation and trouble free operation of the OPW 71 SO Overfill Prevention Valve. Read and follow these steps carefully, checking Riser Pipe them off as you proceed. with Face (A) Seal Adaptor To Tank Figure numbers correspond to step numbers for Top(I.D.) To Tank (B) easy reference. Bottom STEP 1: MEASURE L � I Install the OPW Face Seal Adaptor and the OPW 6-1/2" Thread-on Spill Container on the Fill Riser(Refer to the Installation Instructions Supplied with the Spill Container). Insert the 71 SO measuring stick Figure 1 through the riser pipe and hook it under the inside of the tank in the lengthwise direction. Mark the measuring stick at the top of the Face Seal Adaptor threads inside the base of the spill container bucket just below the drain valve outlet window(See Figure 1 &1A). The top flange on the 71 SO will rest on the Face Seal Adaptor just below the drain valve outlet, 4" NPT and be locked in place between the Face Seal Nipple Adaptor and the 4" nipple that is installed in the spill container with the Jack Screw Kit (See Figure 1A). (For riser pipe configurations other than that shown, consult installation drawings or use other necessary o means to measure Dimension "A"). OPW Spill Container Using a tape measure, measure the distance from Jack Screw the top of the Face Seal Adaptor in the spill Mark measuring Kit container to the bottom of the tank(Dim. "B"). stick here for Jack Screw O-Ring Seal IMPORTANT: Inspect the riser pipe for any foreign installation material. Over spray from tank relining or any (Top of Face Face Seal internal burrs inside of pipe must be removed prior Seal Adaptor) 71SO Adaptor to installation. Failure to have an unobstructed riser pipe may prevent proper installation and operation of Figure 1A 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: MARK THE TUBE Measuring Stick Use the result from STEP 1 and HOW TO LOCATE THE POSITION OF THE 71 SO AT 95% TANK r CAPACITY to mark the upper tube. Measure the j distance from the seam where the upper tube and valve body meet. For"C" measurements less than Transfer Mark or equal to 6-1/2" see Figure 2. For"C" From Stick to measurements greater than 6-1/2" use a tape Upper Tube measure to mark the calculated upper tube length (Cut Line) onto the upper tube. Seam Figure 2 (For"C"less than or equal to 6-1/2"only) OPW 71 SO Overfill Prevention Valve Page 5