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OPW 71SO Overfill Prevention Valve


The OPW 71SO is a vapor-tight two-stage shut-off valve. When the liquid level rises to about 95% of tank capacity, the valve mechanism is released, closing automatically with the flow. This reduces the flow rate to approximately 5 gpm through a bypass valve. The operator may then stop the filling process and disconnect and drain the delivery hose. As long as the liquid exceeds the 95% level, the valve will close automatically each time delivery is attempted.


  • Valve Body: Cast aluminum
  • Float: Nitrile rubber, closed cell foam
  • Valve: Aluminum
  • Seals: Viton®
  • Upper & lower drop tube: Aluminum
  • Plastic parts: Acetal
  • Hardware: Stainless steel
Weight 16 lbs
Dimensions 60 × 6 × 6 in
Bury Depth

5', 10'