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![4 inch 71SO Series CARB EVR Certified Vaportight Testable OPV Overfill Prevention Valve For Up To 10 Foot Diameter Tank With 10 Foot Burial 4 inch 71SO Series CARB EVR Certified Vaportight Testable OPV Overfill Prevention Valve For Up To 10 Foot Diameter Tank With 10 Foot Burial](https://shop.sourcena.com/lowres/detail/71SO-410CT.jpg)
4 inch 71SO Series CARB EVR Certified Vaportight Testable OPV Overfill Prevention Valve For Up To 10 Foot Diameter Tank With 10 Foot Burial
Item No. 71SO-410CT
The OPW 71SO Overfill Prevention Valve is a 2-Point Shut-off Valve designed to prevent the overfill of Underground Storage Tanks by providing a positive shut-off of product delivery. When the liquid level rises to about 95 Percent of tank capacity, the valve automatically slows flow. If the delivery is not stopped and liquid rises to about 98 Percent of tank capacity, the valve closes completely and liquid cannot flow.
![44-1/4 Inch Fiberglass Composite Plain Grey Cove Bolt-Down Manhole With Recessed Handle 10 Inch Skirt 44-1/4 Inch Fiberglass Composite Plain Grey Cove Bolt-Down Manhole With Recessed Handle 10 Inch Skirt](https://shop.sourcena.com/lowres/detail/44CD-WT10.jpg)
44-1/4 Inch Fiberglass Composite Plain Grey Cove Bolt-Down Manhole With Recessed Handle 10 Inch Skirt
Item No. 44CD-WT10
Lightweight and extremely durable composite cover manhole makes sump access safer and easier
![Medium Bury Polyethylene Tank Sump With Mechanically Fastened Cover Medium Bury Polyethylene Tank Sump With Mechanically Fastened Cover](https://shop.sourcena.com/lowres/detail/TSM-4536.jpg)
Medium Bury Polyethylene Tank Sump With Mechanically Fastened Cover
Item No. TSM-4536
36 inch manway diameter x 45 inch base one piece design provides reliable watertight integrity and long product life