Their ease of installation, non-reactive nature to sewer gas, and lack of joints makes our Fiberglass Manholes a great candidate for any treatment system. Infiltration and exfiltration are common in concrete treatment systems, as sewer gas prematurely corrodes concrete, particularly where two separate pieces join. The monolithic design of our manholes eliminates this problem. Made of one continuous piece of non-reactive fiberglass, with no joints to fail, and ranging in size from 3’ to 50’ (or more upon request) the possibility of infiltration and exfiltration is drastically reduced compared to an equivalent manhole made of concrete. Concrete manholes are often known to corrode after 5 to 10 years depending on conditions underground, while we have had fiberglass manholes in the ground for over 45 years and have never had a single failure.


Lightweight and structurally sound to withstand H-20 axle loads, our manholes are easy to install, taking only a small crew and a few hours, and are very reliable once in the ground. They offer an economical and effective solution to your wastewater system needs.


Features and Benefits:

  • H20 Load Rated
  • Corrosion Resistance
  • Structural Strength
  • Lightweight
  • Monolithic Design
  • ASTM D 3753
  • Diameters (42”, 48”, 54”, 60”, 66”, 72”, 96”, 120”)
  • Lengths 3’ to 50’ (custom lengths available)
  • Cone openings ( Concentric: 22 ½”, 32”, 38”; Eccentric: 22 1/2”)
  • Corrosion and structural limited warranty in effect at time of shipment




For product literature, specifications, and installation instructions Click Here

Fiberglass manholes

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