Below Ground Products
Underground Storage Tank Equipment
The OPW 104C 20" (500mm) Composite Cover Manholes allow easy access to UST monitoring equipment and provide additional space for electrical junction boxes.
Download the 104C Composite Cover Manhole Catalog Page
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The following U.S. patents have expired: 4,199,012; 4,351,375; 4,429,725; 4,505,308; 4,453,578; 4,497,350; 4,557,302; 4,649,969; 4,682,714; 4,825,914; 4,971,121; 5,007,468; 5,135,029. OPW claims no rights in any patent beyond its expiration.