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Maintenance Inspecting/Verifying 95% Level (Without <br /> The 708-590 Series Overfill Prevention Valve has no Removing from Tank) <br /> periodic maintenance requirements. FOR DIMENSIONS"A" & "B": Refer to the"installation <br /> However. if the drop tube and valve assembly is removed record sheet" or re-measure and re-calculate per figure 1. <br /> from the tank (for inspection or service), inspect the <br /> drop tube seal for wear/damage (Figure 163, Replace if 1. Measure Dimension "Z" (Figure 18) <br /> necessary. (Upper drop tube flange to <br /> edge of upper tube adapter) <br /> . ..... 2. Verify using the calculation below <br /> A" (Drop tube seal surface to <br /> bottom of tank) <br /> " <br /> (Subtract) <br /> Drop Tube Gasket Installed d "B" (95%Volume from tank chart) <br /> nentation) <br /> (Subtract) <br /> (95%Shutoff level offset) <br /> I I 4.5" (114mm)I I <br /> Figure 16:Inspect Gasket (Equals) <br /> Additionally, if the upper or lower drop tube is <br /> unthreaded/removed from the OPV, the 0-ring(s)should <br /> be replaced (Figure 17). Same value as 'T' <br /> indicates correct installation <br /> Inspect 0-ring <br /> Measure <br /> 0 <br /> W <br /> (114 mm) <br /> ii <br /> Inspect 0-ring <br /> Figure 17:Inpect O-Rings Figure 18.,Dimension Verification After Installation <br /> e4, <br />