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The model valve 47-20 is pre-assembled for installation with a 18" x '/4-2o threaded rod. <br /> The threaded rod should be cut to determine a Length L as shown in Figure 1. This <br /> length L will determine the fill capacity for shut off as specified by the tank specification <br /> manual for 90% or 95% capacity. <br /> 1. Measure the height H from the bottom of the tank as shown <br /> in Figure 2. <br /> 2. Determine whether a 90% or 95% capacity fill is required <br /> and refer to the tank specification manual to locate the <br /> height of 90% or 95% capacity fill as shown in Figure 3. <br /> L <br /> Fig 1 <br /> Pre-determi ned <br /> length <br /> N <br /> Figure 2 Tank Height Dimension <br />