3D Hybrid Composite Round Manhole Cover Anti-Slip, Anti-Theft

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High-strength round manhole cover made from 3D hybrid composite panels filled with special concrete. Designed as a non-recyclable, anti-theft alternative to cast iron covers while maintaining high mechanical strength (4-ton rated load). Features an anti-slip surface, corrosion resistance, zero maintenance requirements, and long service life. Approved for urban infrastructure, water & sewage networks, and municipal applications.