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2970
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752
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2840
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2504
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673
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1224
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159
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1459
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1883
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1348
- Fiberglass - Fiberglass technology allows manholes to be engineered with all features as one unit: manhole barrel, cover, weirs, flumes, and grinder channels. The technology allows seamless sealing of the units. These manholes are one-tenth the weight of a concrete manhole, making them easy to handle and install, and they are environmentally friendly and highly durable.