15. Apply pipe thread sealant compound to the male threads of the A1100EVR
base.
16. Manually tighten both
top and bottom drop
tubes to avoid cross
threading.
17. Use two fabric strap wrenches to permanently tighten.
IMPORTANT: Once the Seals-All sealant has cured for a minimum of 24
hours and before installing the A1100EVR overfill prevention valve into the
underground storage tank, a leak tightness integrity test must be performed.
18. Test the A1100EVR overfill prevention valve by sealing both ends with
inflatable plumber’s plugs. Apply a maximum pressure of 2 inches of water
column. Should the leak rate exceed the allowable limit of 0.17 CFH, locate
the leak point by spraying soap solution along the outside of the A1100EVR
overfill prevention valve.
IMPORTANT: Do not exceed the maximum presssure of 2 inches of water
column. This will damage the A1100EVR overfill prevention valve and result
in voiding the warranty.
6
3
A1100EVR Overfill Prevention Valve to Lower Drop Tube
Place tape
measure here
Measurement C,
cut length
Figure 3
2. Find measurement B from the chart below, the distance from the maximum
fluid level allowed to the inside top of the tank. The calculations are based
on cylindrical tanks with flat ends. For exact dimensions, consult the manu-
facturer’s tank charts. Use the actual capacity of the tank for calculations.
NFPA30 Guidelines limit tank fill to 95%.
95% Shut-off
Tank Diameter B Dimension
Feet Meters Inches mm
6.5’ 1.98 7.5" 190
7.0’ 2.13 8.0" 203
7.6’ 2.29 9.0" 229
8.0’ 2.44 9.5" 241
8.2’ 2.50 9.5" 241
8.5’ 2.59 10.0" 254
9.0’ 2.74 10.5" 267
9.5’ 2.90 11.0" 279
10.0’ 3.05 11.5" 292
12.0’ 3.66 14.0" 336
IMPORTANT: The A1100EVR overfill prevention valve is not recommended
for tanks under 6.5 feet in diameter.
3. Top Tube Cut Location, Measurement C: Add measurements A and B.
Place tape measure at the 95% fill mark on the valve and measure up the
tube as shown. Mark and cut the tube at the C measurement length.
Example: Top drop tube cut length, C = A + B
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