Fiberglass & Below-Ground Enclosures
Corrosion-resistant fiberglass enclosures for protecting valve assemblies, utility infrastructure, and power distribution systems above and below ground.
Durable Protection for Every Environment
Our fiberglass enclosures deliver superior protection for underground and above-ground utility infrastructure. Engineered from high-strength fiberglass composite materials, these enclosures resist corrosion, extreme weather, and chemical exposure while providing secure, accessible housing for critical equipment.
Available as complete assemblies or individual components, our enclosures serve power utilities, water distribution, gas infrastructure, and telecommunications installations. Compared with traditional concrete vaults, fiberglass and composite enclosures are easier to set in place and well suited for demanding soil and moisture conditions.
Features & Benefits
Corrosion Resistant
Fiberglass composite construction is non-corrosive and performs well around moisture, wastewater gases, road salt, chemicals, and aggressive soils. In corrosive environments, fiberglass can also reduce the need for protective coatings or liners often used with concrete.
Non-Conductive
Fiberglass is naturally non-conductive, making these enclosures the safe choice for electrical and power utility applications where metal enclosures pose a risk.
Weather Resistant
Engineered to withstand extreme weather conditions including UV exposure, heavy rain, flooding, and temperature swings without degrading or losing structural integrity.
Easier Than Concrete to Handle
Fiberglass and composite vaults are much lighter than concrete, making them easier to ship, unload, move, and set in place. That can reduce crane time, equipment needs, crew size, and installation labor.
Low Maintenance
No painting, coating, or special treatment required. Fiberglass maintains its structural and aesthetic properties with minimal upkeep throughout its service life.
Less Cracking Risk
Concrete is strong in compression but can crack from settlement, freeze-thaw movement, impact, or shifting soil. Fiberglass has more flex and does not absorb water like concrete, making it more forgiving in many underground applications.
Enclosure Solutions
Complete range of fiberglass enclosure products from individual components to fully assembled units designed for faster installation with less site disruption.
Complete Assemblies
Fully integrated fiberglass enclosure units pre-assembled with covers, hardware, and mounting systems for rapid site installation and immediate deployment.
Enclosure Boxes
Individual containment structures for below-ground vault and above-ground housing applications across utility sectors.
Covers & Lids
Protective top panels and closure systems engineered for secure sealing, load-bearing capacity, and easy access to enclosed equipment.
Hardware & Accessories
Fastening systems, mounting brackets, locking mechanisms, and additional components for secure, dependable enclosure installations.
Above-Ground Enclosures
Weather-resistant fiberglass housings for valve assemblies, backflow preventers, and utility equipment requiring surface-level access and protection.
Below-Ground Vaults
Subsurface fiberglass enclosures rated for underground installation, protecting buried infrastructure while maintaining code-compliant access points.
Hubbell
Power & Utility Infrastructure Solutions
Hubbell Incorporated is a global leader in electrical and utility infrastructure products. Their below-ground enclosure line serves power, water, and gas distribution markets with high-quality fiberglass solutions engineered for demanding underground environments. Backed by decades of innovation and trusted by utilities nationwide.
Visit HubbellNeed Enclosures for Your Project?
Contact us today for pricing, specifications, and expert guidance on selecting the right fiberglass enclosure for your application.