Extraco custom manufactures preformed Glass Reinforced Plastic (GRP) manholes, vacuum-tested tank sumps, inspection chambers, and gully pots engineered specifically for sewage treatment plants, municipal storm water systems, and industrial discharge[cite: 4].
Preformed GRP composite systems engineered to eliminate concrete degradation in toxic effluent environments[cite: 4].
Designed for inspection, cleaning, ventilation, and housing pumping stations[cite: 4]. Features integrated smooth benching and channels engineered to prevent splashing and solid deposition[cite: 4].
100% non-corrosive sumps vacuum-tested for absolute tightness against water intrusion[cite: 4]. Features flush-to-grade watertight covers[cite: 4].
Single-entity composite units delivered complete with connecting ports, ideal for single-pour concreting[cite: 4].
Structural comparison demonstrating why municipal authorities choose GRP preformed manholes[cite: 4].
| Performance Parameter | Extraco GRP Structural Manholes | Precast Concrete Manholes |
|---|---|---|
| Acid & H₂S Gas Attack | 100% Corrosion Immune (No degradation)[cite: 4] | Severe microbial corrosion & spalling |
| Water Infiltration / Seepage | Monolithic 100% Watertight Seal[cite: 4] | High seepage risk at cold ring joints |
| Handling & Crane Requirements | Ultra-Lightweight (Low crane rating needed)[cite: 4] | Extremely heavy (Requires heavy crane) |
| Internal Flow Friction | Smooth Glossy Surface (Prevents deposits)[cite: 4] | Rough surface leading to solid deposits |
| Operational Design Life | 50+ Years (Zero maintenance required)[cite: 4] | 15 - 20 Years (Requires frequent relining) |
Manufactured under strict ISO 9001:2015 quality assurance protocols for design, manufacturing, and erection[cite: 4].
Certified for Design, Manufacturing, Erection, and Commissioning of GRP/FRP sewerage and specialty products[cite: 4].
European standard for preformed plastics manholes and inspection chambers for buried drain and sewer systems[cite: 4].
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