AVT vs Fibre Concept Manhhole Covers Karachi Pakistan. Comparison between two popular Brands in Pvc Manhole Covers & Gratings for House & apartment Buildings. AVT vs Fibre Concept Manhole Covers in Karachi is a common comparison for homeowners, builders, and facility managers. In day-to-day use, both brands deliver sturdy, weather-resistant plastic (PVC) covers suitable for […]