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Openchannelflow fiberglass manholesOpenchannelflow Fiberglass Manholes are a cost effective solution to the need to measure or control piped flows below grade. 

Openchannelflow manufactures a variety of different types of Fiberglass Manholes to solve a variety of needs: 

At the core of each Openchannelflow Fiberglass Manhole is our ASTM D3753 highway rated manhole barrel.  The barrel is light weight and yet still provides high strength, as well as excellent corrosion resistance.

Once integrated into one of our manhole structures above, the resultant unit is lightweight, watertight, easy to install, and requires virtually no maintenance. 

Dig it!  Drop it! Done!