OPW | 71SO-400C | 4" Overfill Prevention Valve - 4" x 5' Vapor Tight

SKU: 71SO-400C

Call for Pricing: (800) 515-2580

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Due to the nature of how drop tubes must be shipped, the shipping variable is inconsistent based on several factors. Please call to order drop tubes to get the most accurate pricing that includes the freight charges. 800-515-2580

The CARB-certified OPW 71SO vapor-tight Overfill Prevention Valve is designed to prevent the overfill of underground storage tanks by providing a positive shut-off of product delivery. The shut-off valve is an integral part of the drop tube used for gravity filling. The OPW 71SO allows easy installation (without breaking concrete) and requires no special manholes.
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.
If the delivery is not stopped and the liquid rises to about 98% of tank capacity, the bypass valve closes completely. No additional liquid can flow into the tank until the level drops below a reset point.  Valve Body: Cast aluminum
Float: Nitrile rubber, close cell foam
Valve: Aluminum 
Seals: Viton®
Upper & lower drop tube: Aluminum  
Plastic parts: Acetal
Hardware: Stainless steel

This product does not qualify for the $400 Free Shipping threshold due to size and UPS upcharge to ship.  Please click HERE to read our Shipping Policy.


A-Upper Tube Length - 60in/1.5m  

B-Lower Tube Length - 83in/2.1m  

C-Overall Length - 154-3/4"in/1.4m

Max Nominal Tank Diameter - 96in/2.4m

Max Actual Tank Diameter - 107in/2.7m


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